IBC Tote Mixers for Water Treatment Polymer and Flocculant
Keep emulsion polymer uniform from the first gallon to the last.
Liquid emulsion polymers stratify in storage. A portable, low-shear IBC tote mixer restores uniformity in the neat polymer before it reaches the feed and activation system — without a dedicated recirculation loop at every tote.
Quick Answer: What Polymer Tote Mixing Is and Why Operators Do It
Polymer tote mixing — also called reagitation or rehomogenization — is the gentle, low-shear circulation of neat liquid emulsion polymer inside its IBC tote before that polymer is transferred into a feed or make-down system. It is done because emulsion polymers can separate during storage, meaning the material drawn from a tote late in its life may not match that drawn from it when the tote was new.
Reagitation is not the same as polymer activation. Reagitation happens before the feed system, inside the tote, at low speed. Activation happens after the polymer meets dilution water, in the make-down system.
Why Emulsion Polymer Separates During Storage
Many liquid polymer flocculants used in water treatment are supplied as inverse emulsions: a polymer gel phase dispersed within a hydrocarbon-based continuous phase. Because those phases have different specific gravities, gravity acts on them differently over time.
What Is Inside an Emulsion Polymer Tote
Water Environment Federation training materials illustrate a representative emulsion-polymer composition as approximately:
Component | Approximate proportion |
|---|---|
Polymer gel | 40% |
Water | 30% |
Hydrocarbon oil | 30% |
In that same example, the polymer gel particles measure roughly 0.1–2 microns. [2]
What Separation Looks Like
As the phases stratify, a stored tote can develop:
- A more oil-rich layer toward the top
- A more polymer-rich or thickened layer toward the bottom
- Progressive variation in the material withdrawn as the tote empties
- A source of inconsistency that reaches the activation system before anyone measures it
How Long Does It Take for Emulsion Polymer to Separate?
Visible layering is not immediate, and its absence does not prove the tote is uniform. One polyacrylamide-emulsion handling handbook reports that an observable oil layer may not appear for three to four months in many formulations, even though separation behavior can begin earlier. [3]
The practical implication: judging tote uniformity by looking through the fill port is unreliable. Handling decisions should follow the supplier’s storage and agitation guidance rather than visual inspection alone.
“Our EvenMix mixer has been working great and has saved us a lot of money and time. We use it to mix polymer in 275-gallon totes at our 34 million gallon-per-day potable water treatment plant. Before installing the EvenMix mixer package, our polymer was separating and going bad before we were able to use the entire tote - which meant wasting product, purchasing additional chemical, and paying disposal fees. The mixer has certainly paid for itself and has remained reliable.”
-Evan Dewindy - Water Treatment Facilities Supervisor I Olivenhain Municipal Water District
What Industry and Supplier Guidance Says
Water Environment Federation
The Water Environment Federation states that emulsion polymer tends to stratify during storage and identifies two methods for addressing it before the neat polymer enters the activation system: [1]
- A drum or tote mixer
- A recirculation pump
WEF operator guidance also cites a typical recommended storage range of 41–86°F (5–30°C) and a six-month shelf life for properly stored emulsion polymer. [1]
Solenis
The product data sheet for Zetag™ 9248FS, a high-molecular-weight cationic polyacrylamide emulsion flocculant, states that prolonged storage — particularly at elevated temperatures — can cause the product to separate into layers, and that gentle agitation is needed to reverse that layering. The data sheet also directs users to gently stir or recirculate product in bulk storage, to keep IBCs out of direct sunlight, and to avoid outdoor storage without indirect temperature control. [4]
SNF Polyacrylamide Emulsions Handbook
An SNF polyacrylamide-emulsion handbook recommends homogenizing emulsions stored for more than one month before use, and emphasizes: [3]
- Gentle agitation
- Short mixing periods
- Avoiding excessive shear
- Avoiding prolonged agitation
For tote containers, the handbook gives a recommended agitation time of approximately 10 minutes every 2 to 3 days, and immediately before use. [3]
Storage and Shelf-Life Figures Vary by Supplier and Product
General industry guidance and individual product data sheets do not always agree, and both change over time.
Source | Storage range | Stated shelf life |
|---|---|---|
Water Environment Federation (general emulsion polymer guidance) | 41–86°F / 5–30°C | 6 months [1] |
Solenis Zetag™ 9248FS product data sheet (EMEA revision) | 5–35°C, not exceeding 40°C for prolonged periods | 12 months from date of manufacture in original packaging [4] |
The polymer supplier’s product-specific documentation always takes precedence over general guidance, including anything on this page.
Does a Diaphragm Pump Already Mix the Tote?
Ordinarily, no.
A diaphragm pump transfers or meters polymer out of a tote. Drawing product from the bottom of a container does not circulate the container. A pump only homogenizes a tote when it is built into a properly designed recirculation loop that returns material to the vessel.
Even where a recirculation loop exists, many polymer manufacturers still recommend low-shear mechanical agitation to confirm the vessel is uniform throughout — not just along the path the loop happens to sweep.
The question worth asking: is the polymer entering your feed system near the end of a tote still representative of the polymer that entered it at the beginning?
Tote Mixer vs. Recirculation Pump: How the Two Approaches Compare
WEF identifies both as valid methods. They differ in installation burden, portability, and what they leave behind.
Consideration | Portable tote mixer | Recirculation pump loop |
|---|---|---|
Installation | Inserted through the tote’s 6″ opening; removed when finished | Dedicated pump, return piping, hoses, and valves at each location |
Portability | One unit can serve multiple compatible totes | Generally fixed to a feed point |
Coverage | Mechanical circulation through the body of the container | Depends on loop design, return placement, and flow path |
Cleaning | Mixer assembly is removed and cleaned | Piping and hoses require a cleaning procedure |
Footprint | Stored off the floor when not in use | Permanent equipment at each tote position |
Best suited to | Multiple feed points, frequent tote changes, temporary or mobile systems, limited floor space | Permanent single-point installations where the loop is already engineered |
Neither approach is universally correct. Facilities with an engineered recirculation loop already in service may not need a separate mixer; facilities with several feed points, frequent tote turnover, or no existing return piping often find the portable option easier to standardize around.
Reagitation and Activation Are Not the Same Process
This is one of the most consequential distinctions in polymer handling, and one of the easiest to blur.
Tote reagitation | Polymer activation (make-down) | |
|---|---|---|
Where it happens | Inside the IBC, in neat concentrated polymer | Downstream, after the polymer meets dilution water |
Purpose | Restore uniformity before transfer | Invert, dissolve, and uncoil the polymer chains |
Mixing energy | Gentle, low speed, low shear | Higher energy at initial wetting, then lower energy |
Duration | Short and intermittent | Governed by the make-down system design |
Equipment | Tote mixer or recirculation loop | Feed pump, make-down unit, aging tank, injection system |
Activation requires higher mixing energy during initial wetting to disperse the emulsion into water, followed by lower-energy mixing to prevent the activated polymer chains from being sheared apart. [1][2]
An IBC tote mixer addresses the storage stage only. It does not replace the polymer feed pump, make-down or activation system, aging tank, or injection equipment.
Why Aggressive Mixing Is the Wrong Goal
The objective inside the tote is gentle, controlled rehomogenization — not dispersion.
Excessive shear or prolonged agitation can destabilize some neat polymer emulsions, and excessive mixing after activation can break the long polymer chains that enable flocculation. High-speed, high-shear agitation can render some polymers less effective. [1][3][4]
Non-aggressive reagitation is a reasonable general practice at many water treatment operations. It is not a substitute for the material’s own handling instructions, which should govern mixing speed, duration, and frequency.
What Can Happen When a Tote Is Not Uniform
Polymer performance problems can have many possible causes, including changes in sludge characteristics, dosage, influent quality, temperature, feed equipment, and activation efficiency. Tote stratification is one additional variable, and one that is easy to overlook because it is invisible from outside the container.
A nonuniform tote may contribute to:
- Inconsistent floc formation, settling, or clarification
- Variable dewatering performance or a wetter sludge cake
- Higher solids or turbidity in treated water
- Underfeeding, overfeeding, or repeated operator adjustments
- Changing pump or transfer behavior as the tote empties
- Thickened material remaining near the bottom of the container
- Operators suspecting a bad batch when storage separation may be involved
Reagitation will not solve every polymer performance problem, and this page does not suggest it will. What it does is remove one avoidable variable, so that troubleshooting can focus on the process rather than the container.
There is also a recovery argument. Thickened material left at the bottom of a tote is purchased product that never reaches the process, and totes returned with polymer residue may require cleaning before they can be recycled or sent back to the supplier.
Signs Your Polymer Tote Handling Is Worth Reviewing
These indicators do not prove stratification is occurring. They indicate an application worth investigating.
- Emulsion polymer regularly sits unused for days or weeks
- Process performance appears to shift over the life of a single tote
- Product near the bottom of the tote looks or pumps differently
- The transfer pump struggles as the tote approaches empty
- Meaningful volume remains in totes at changeout
- Totes are exposed to large temperature swings
- Polymer has previously frozen or been stored outside its recommended range
- Your polymer supplier’s documentation recommends agitation or recirculation before use
How the EvenMix IBC Tote Mixer Works
EvenMix is a United States manufacturer of portable, modular mixing equipment for IBC totes, drums, and pails. For water treatment polymer, the relevant product is a lightweight tote mixer that an operator carries to the tote, inserts through the standard opening, runs at low speed, then removes and cleans.
The Blade Design
The mixer uses patented variable-pitch folding blades. The blades fold to pass through the tote’s 6″ bung opening and open to 16 inches in diameter once inside the container — a working diameter that would otherwise be impossible to introduce through a standard IBC fitting.
In the two-blade configuration, both blade sets work together to provide axial and radial flow patterns within the container. This bidirectional mixing flow ensures the entire container remains homogeneous and helps break up settled material in the corners and at the bottom of the container. This allows full use of the container’s material without shearing it or trapping air in a vortex.
Published Specifications
Specification | Detail |
|---|---|
Blade diameter (unfolded) | 16″ |
Blade and shaft material | 316 stainless steel |
Standard shaft length | 32″ (customizable up to 45″ for standard IBC totes) |
Tote opening | 6″ cap included; 9″ and other caps available on request |
Blade sets | One or two; blade sets are adjustable vertically along the shaft |
Digital drive speed range | 20 preset speeds, approximately 27–153 RPM, with multiple mixing modes |
Viscosity capability | Two-blade configuration rated for materials upward of 20,000 cP (intermittent duty) |
Complete package weight | Approximately 12–18 lb depending on drive |
Design intent | Low- to no-shear circulation without air entrainment |
Why Low Weight and Modularity Matter in a Polymer Room
Full IBC totes are heavy and are positioned around existing pumps, make-down systems, and process equipment. They are not moved casually. A complete mixer package in the 12–18 lb range can be carried to the tote and installed by one person without a forklift, pallet jack, or tow motor — so the mixer goes to the material rather than the material going to the mixer.
Modularity matters for a second reason: the drive is separable from the mixer assembly. If a drive fails, it is swapped for another in seconds rather than routed through maintenance or an outside service call. Drives can be returned to EvenMix for repair when needed.
That flexibility is most valuable at facilities with multiple polymer feed points, frequent tote changes, temporary or mobile treatment equipment, or constrained floor space.
Choosing a Power Option: Digital, Air, or Battery
All three packages use the same reusable double-blade platform on a 32″ shaft. They differ only in how the drive is powered, so selection usually comes down to which utility is already available at the tote.
120V Digital D-6-32-0-16-04-2-2 | Air-Driven A-6-32-0-16-04-2-2 | Battery-Powered B-6-32-0-16-04-2-2 | |
|---|---|---|---|
Power source | Standard 120V outlet | Clean, dry compressed air | DeWalt or Milwaukee battery |
Approximate package weight | 18 lb | 12 lb | 18 lb (excluding battery) |
Speed control | Digital preset speeds / ~150 Max RPM | Air pressure and airflow control | Digital preset speeds / ~100 Max RPM |
Site requirement | Outlet near the tote | Air supply and air-preparation equipment | Charged batteries on hand – mobile operation |
At the mixing location | Power cord | Air hose | No cord or hose |
Best suited to | Indoor polymer-feed areas with standard electrical service | Plants standardized on pneumatic equipment, or no outlet near the tote | Remote totes, outdoor areas, mobile and temporary systems |
120V Digital IBC Tote Mixer — D-6-32-0-16-04-2-2
The most straightforward option where standard electrical service reaches the tote. Plug-in operation, adjustable low-speed circulation, two patented variable-pitch folding blade sets positioned vertically along a 32″ shaft, and a fully modular assembly that is removed and cleaned between uses. Commonly specified for municipal wastewater plants, industrial treatment facilities, and indoor polymer-feed rooms.
Air-Driven IBC Tote Mixer — A-6-32-0-16-04-2-2
The lightest of the three packages, and the option for facilities that prefer pneumatic equipment or lack convenient power at the tote. Speed is controlled through air pressure and airflow. The drive requires an adequate supply of clean, dry compressed air and appropriate air-preparation equipment.
Hazardous-area note: the standard EvenMix air-driven package is a non-sparking air drive and is not represented as ATEX-certified. Site-specific hazardous-area classification and requirements should be reviewed before selecting any equipment for a classified location.
Battery-Powered IBC Tote Mixer — B-6-32-0-16-04-2-2
Maximum portability, with no cord or hose at the mixing location. Runs on commonly available DeWalt or Milwaukee batteries, which most maintenance departments already stock and charge.
As a planning figure, EvenMix reports roughly one hour of mixing per 2Ah of battery capacity at maximum speed in a thick material — so a 6Ah battery yields approximately three hours under those conditions. Actual runtime depends on battery capacity, mixer speed, polymer characteristics, and operating conditions, and will generally be longer at the low speeds appropriate for polymer reagitation. When a battery runs down, it is swapped for a charged one.
Particularly useful for remote tote-storage areas, mobile water-treatment systems, temporary installations, outdoor applications, and facilities moving a single mixer between locations.
How to Reagitate a Polymer Tote
Follow the polymer supplier’s documented procedure first. Where that documentation is silent on method, the following sequence reflects the general practice described in the guidance cited on this page.
- Check the supplier’s handling instructions. Confirm whether agitation is recommended, and note any stated limits on duration, frequency, or shear.
- Confirm storage conditions. Verify the tote has been held within the supplier’s recommended temperature range and has not frozen. Material stored outside that range may need supplier review before use, not just mixing.
- Insert the mixer through the tote opening. The folding blades pass through the 6″ bung and open inside the container. Position the blade sets vertically along the shaft to suit the tote’s fill level.
- Start at low speed. Begin at the low end of the speed range and increase only as needed to establish visible circulation. The goal is bulk movement of the container’s contents, not turbulence or vortexing.
- Run for a short, defined period. Published emulsion-handbook guidance recommends roughly 10 minutes for tote containers, repeated every 2 to 3 days during storage and immediately before use. [3] Confirm against your supplier’s recommendation.
- Avoid continuous operation unless the polymer supplier specifically recommends it. Prolonged agitation is cautioned against in the guidance cited here. [3][4]
- Remove and clean the assembly. Clean the shaft and blades before moving the mixer to a different polymer to prevent cross-contamination between products.
Common mistakes: running at high speed to “mix faster,” leaving the mixer running between transfers, judging uniformity visually, and using the same uncleaned assembly across different polymer chemistries.
Where Polymer Tote Mixing Is Used
Water treatment extends well beyond municipal sewage. Polymers and flocculants are used across municipal and industrial systems to separate solids and contaminants before water is discharged, reused, or returned to production. [5][6]
Common settings include:
- Municipal wastewater treatment
- Industrial wastewater treatment
- Sludge thickening and dewatering
- Belt presses, centrifuges, and filter presses
- Clarification processes
- Temporary and mobile treatment systems
- Polymer manufacturers and distributors supporting end-user facilities
Downstream industries treating or reusing process water include steel and metal manufacturing, pulp and paper, chemical manufacturing, food processing, mining and mineral processing, and power generation.
Potable water note: drinking water treatment carries additional requirements, including certification of treatment chemicals under NSF/ANSI/CAN 60 and confirmation that any equipment contacting the chemical is acceptable for that use. Not every emulsion flocculant is approved for potable applications. Confirm suitability with both the polymer supplier and the equipment manufacturer before specifying.
What Polymer and Flocculant Actually Do
Fine particles in water are often too small, too light, or too electrostatically stable to settle on their own. Coagulants destabilize those particles; polymer flocculants then use long molecular chains to gather them into larger aggregates called flocs. [5]
Larger flocs are easier to settle, float, filter, clarify, or remove through a belt press, centrifuge, or other dewatering process — supporting clearer treated water, better sludge thickening, and more consistent dewatering.
Terminology: in water treatment, most flocculants are high-molecular-weight polymers, frequently polyacrylamide-based. “Polymer” describes the chemistry; “flocculant” describes the function. This page addresses liquid emulsion polymer flocculants supplied in IBC totes. [5]
What an IBC Tote Mixer Does Not Do
Stating limits plainly is more useful than overselling.
- It does not replace a polymer feed pump, make-down or activation system, aging tank, or injection equipment.
- It does not correct polymer that has degraded from freezing, heat exposure, or age beyond its shelf life.
- It does not guarantee a reduction in polymer dosage. Consumption depends on the full process, and any dosage claim requires application-specific testing.
- It does not diagnose polymer performance problems with other root causes.
- It does not substitute for the supplier’s handling instructions.
Frequently Asked Questions
Does a diaphragm pump already mix the tote?
Not ordinarily. A diaphragm pump transfers or meters polymer out of the tote; it provides circulation only when incorporated into a recirculation system that returns polymer to the container. The Water Environment Federation identifies a tote mixer and a recirculation pump as two distinct approaches to stored-emulsion stratification. [1]
Can excessive mixing damage polymer?
Yes — and so can using the wrong type of mixer. Excessive shear or prolonged agitation can destabilize some neat polymer emulsions, and excessive mixing after activation can damage the polymer chains. That is why the objective inside the tote is gentle, low-speed circulation rather than high-shear dispersion. [1][3][4]
How long should a polymer tote be mixed?
There is no universal answer. One emulsion-polymer handbook recommends approximately 10 minutes every 2 to 3 days, and immediately before use, for example, for tote containers. [3] Other manufacturers publish different guidance. The correct procedure depends on the polymer formulation, storage period, temperature, tote condition, and mixer performance.
Should the mixer run continuously?
Usually not, unless the polymer supplier specifically recommends it. Both the Solenis guidance and the polyacrylamide-emulsion handbook caution against unnecessary continuous or prolonged agitation in the applications they address. [3][4]
Can an IBC tote mixer replace the polymer activation system?
No. The mixer reagitates neat polymer inside the storage tote. The feed, make-down, activation, aging, and injection systems continue to perform their existing functions.
Will tote mixing reduce polymer consumption?
It may improve consistency and product recovery in some applications, but results depend on the specific process. EvenMix does not claim a guaranteed reduction in polymer dosage without application-specific testing. The immediate objective is to restore uniformity within the tote and remove one potential source of process variation. Many EvenMix customers find that once they implement an EvenMix mixer package, they use their polymer more effectively and with less waste when the tote is drained; however, every situation is different and can depend on factors beyond the mixer itself.
Is the mixer compatible with my polymer?
Blades and shaft are 316 stainless steel. Confirm compatibility against the polymer’s safety data sheet and the supplier’s materials guidance for your specific product, especially for potable water applications or unusual formulations.
Can one mixer serve multiple totes?
Yes. The assembly is designed to be moved between compatible IBC totes and removed when mixing is complete. Clean the shaft and blades between different polymer products to avoid cross-contamination.
Why does portability matter in a water treatment facility?
Polymer totes sit at different feed points and are changed as plant demand shifts. A mixer light enough to be carried and installed by one person can serve several compatible totes and be removed afterward — reducing the need to reposition full IBCs or install separate mixing hardware at every location.
Talk Through Your Polymer Application
Polymer formulations, tote dimensions, storage conditions, and supplier handling recommendations all vary. If you are troubleshooting inconsistent feed, thickened material at the bottom of totes, or simply want to confirm which package fits your utilities, our mixing specialists can walk you through it.
Technical References
[1] Water Environment Federation. Polymer/Flocculants 101: Understanding Polymer for Thickening and Dewatering Processes.
[2] Water Environment Federation. Polymer 101: Fundamentals of Flocculation.
[3] SNF. Polyacrylamide Emulsions Handbook.
[4] Solenis. Zetag™ 9248FS Flocculant Product Data.
[5] SNF. Water Treatment: Flocculation and Coagulation.
[6] U.S. Environmental Protection Agency. Technical Support Document for Industrial Wastewater Treatment.
This page describes general polymer handling practice and EvenMix equipment. It is not a substitute for your polymer supplier’s product-specific storage, handling, and agitation instructions, which take precedence in all cases.