Reverse Osmosis Membrane Cleaning Chemicals & Nanofiltration

Reverse osmosis membrane cleaning chemicals are now being used in a broad range of applications including potable water, mining, leachate, municipal and industrial reuse. AWC® has developed an extensive line of RO chemicals and antiscalants, reverse osmosis membrane cleaning chemicals and biocides to control and reverse all scales and foulants that can form in these applications.

AWC RO biocides have been specifically selected for use with RO/NF membranes.  Our product line includes oxidizing and non-oxidizing biocides that are selected based on water quality and frequency of biological fouling.

  • AWC® C-221
    RO/NF membrane preservative for long-term storage. Odor-free, does not deteriorate O-rings.
  • AWC® D-115
    Non-oxidizing microbiocide for use with industrial RO membrane systems. Highly effective in water with high organics concentrations.
  • AWC® D-420
    Fast-acting non-potable RO microbiocide, highly effective at low concentrations.
  • AWC® D-545G
    Microbiocide for use only with cellulose acetate RO membranes. Effective over a wide range of pH and functions to clean biologically fouled systems.
  • AWC® D-303
    Fast-acting oxidizing microbiocide for use with Reverse Osmosis (RO) / Nanofiltration (NF) membrane systems. NSF approved for use with potable water systems.
  • AWC® D-615P
    Fast-acting oxidizing microbiocide for continuous dosing or off-line cleaning in membrane systems.  NSF approved for use with potable water systems.

Nanofiltration & Reverse Osmosis: RO Membrane Antiscalant

RO systems use crossflow membrane filtration, where the water that is not purified exits the system as a concentrated brine. As water passes to the permeate side, the unpurified fraction of the water is left with all the salts, organics and colloidal particles that are rejected by the membrane. The higher the operating recovery, the more concentrated the brine will be. When dissolved salts in the brine exceed saturation, they begin to precipitate as scales. Likewise, organics and colloidal particles have a higher fouling potential as they become more concentrated along the length of the membrane system. AWC has developed highly effective inhibitors that eliminate the most challenging scales and significantly reduce colloidal and organic fouling in reverse osmosis (RO) and nanofiltration (NF) membrane systems. All AWC antiscalants are NSF approved for use in potable membrane systems. Our antiscalants are highly effective for all feedwater sources, including groundwater, wastewater, fresh surface water, seawater, and municipal water. Our high-performance reverse osmosis (RO) antiscalants are effective at remarkably low dosages and can inhibit scales even at very high saturations. The use of AWC antiscalants can eliminate the need for acid dosing, enable plants to operate at higher recoveries, and reduce cleaning frequencies. AWC RO antiscalants control scales such as calcium carbonate, calcium phosphate, calcium sulfate, barium sulfate, strontium sulfate, calcium fluoride, iron hydroxide, iron phosphate, silica, and colloidal foulants. Our RO antifoulants disperse colloidal silica and natural organic matter.

  • AWC® A-102 Ultra
    Broad spectrum RO antiscalant designed for use with industrial membrane systems.
  • AWC® A-101
    Membrane antiscalant designed for inhibition of sulfate scale formation in challenging feed water; calcium sulfate, barium sulfate & strontium sulfate.
  • Everflux®
    Super concentrated RO antiscalant for reduced shipping cost.
  • AWC® A-102 Plus
    Broad spectrum scale inhibitor designed for use with municipal RO and NF membrane systems.
  • AWC® A-103
    Membrane antiscalant especially designed to inhibit silica scaling at saturation levels up to MSI 12.
  • AWC® A-104
    Phosphorous-free membrane antiscalant with broad inhibition capabilities; highly effective for inhibition of sulfate and phosphate scales.
  • AWC® A-105
    Broad spectrum Reverse Osmosis antiscalant designed for use with municipal water reuse membrane systems.
  • AWC® A-108
    Membrane antiscalant designed for inhibition of calcium carbonate scaling up to CCNI of 2.3. Tolerant to ferric coagulant carryover; Highly effective in water reuse membrane applications.
  • AWC® A-108Fe
    Reverse Osmosis membrane antiscalant for feedwater with high concentration of ferric and/or aluminum coagulant carryover. Highly effective for control of aluminum silicate scales.
  • AWC® A-109
    Reverse osmosis antiscalant that maintains its inhibition properties even in feedwater with very high alkalinity; High resistance to calcium-antiscalant precipitation formation. For use with CCNI up to 2.3.
  • AWC® A-110
    Premium RO Membrane antiscalant that exhibits excellent control of phosphate scale formation even in the presence of ferric coagulant carryover. Highly effective for control of aluminum silicate scales.
  • AWC® A-111 Plus
    Broad spectrum phosphorous-free RO antiscalant designed for use in municipal potable water systems.
  • Veraflux®
    Phosphorous-free, 11X concentrated reverse osmosis antiscalant (by volume) for reduced shipping cost.
  • Ultratek Si
    Colloidal silica dispersant for use with industrial and municipal RO membrane systems. Prevents formed colloidal silica particles from coalescing and depositing on the membrane surface.
  • AWC® A-107
    Broad spectrum Reverse Osmosis antiscalant with tolerance to low concentrations of ferric coagulant carryover.
  • AWC® A-112
    Premium Phosphorous-free RO antiscalant with broad spectrum capabilities. Effective for inhibition of sulfate and phosphate scales at very high saturation potentials. Good tolerance to ferric coagulant carryover.
  • AWC® A-117
    Premium RO/NF antiscalant for control of high levels of ferric and aluminum coagulant carryover.
  • AWC® A-106
    Broad spectrum antiscalant/antifoulant for use with high natural organic matter (NOM) containing feed water.

Multimedia Filtration (MMF) is often used upstream of RO/NF to remove suspended solids that can cause plugging of membrane feed channels and damage the membrane surface.  However, MMF media is only efficient at removing particles larger than 20 – 50 microns.   AWC has developed a line of membrane compatible organic and inorganic coagulants that agglomerate smaller silts, clays and colloids into larger clusters that are more efficiently filterable.  All polymers have been tested extensively to ensure safe use with RO/NF membranes even in case of slight overdosing.

  • AWC® CP-200
    Flocculant/coagulant blend for turbidity & color reduction. Designed for use upstream of RO membranes.
  • AWC® CP-300
    RO membrane compatible cationic flocculant for turbidity reduction upstream of the membrane system. Aids in removal of aluminum carryover.

AWC's membrane cleaning chemicals are highly effective for removing even the most stubborn scales and foulants from RO/NF membranes. Our membrane cleaning chemicals are formulated for all types of RO membrane systems, ranging from those used in Food and Beverage applications to Water Reuse applications.

The outcome of a membrane cleaning is equally dependent on procedure as it is on the quality of the cleaning chemical. However, an optimal procedure isn’t always possible to implement due to limitations in the design of the Clean-In-Place (CIP) system.  AWC can provide recommendations on CIP system design, and can provide training on best practices and procedures to enhance RO membrane cleaning results and to reduce frequency of CIP’s.  Additionally, we offer cleaning studies that allow us to identify the optimal temperature, pH and cleaning time for the membrane foulant in your specific system.

High pH and low pH chemicals are available in both liquid and powder form. 

All of AWC's cleaning chemicals are NSF approved for use in potable membrane systems.

  • AWC® C-205
    Low pH powder RO membrane cleaning chemical for dissolution of carbonate, phosphate and hydroxide scales.
  • AWC® C-209
    Low pH powder RO cleaning chemical for dissolution of silicate scales. Does not contain ammonium bifluoride. Effective for removal of carbonate, phosphate and hydroxide scales.
  • AWC® C-225
    Iron reducing agent for removal of ferric hydroxide fouling during membrane cleaning.
  • AWC® C-226
    High pH powder cleaning chemical for RO membrane cleaning. Effectively penetrates biofilms, oils and greases.
  • AWC® C-227
    High pH powder RO membrane cleaning chemical for removal of heavy fouling by organics such as NOM and dyes.
  • AWC® C-230
    Liquid high pH RO membrane cleaner for dispersing colloidal foulants, silts & clays.
  • AWC® C-234
    Low pH liquid RO membrane cleaning chemical for removal of carbonate, phosphate, and hydroxide scales.
  • AWC® C-235
    Liquid low pH RO cleaning chemical for dissolution of calcium carbonate scaling.
  • AWC® C-236
    High pH liquid RO membrane cleaning compound for simultaneous removal of silica scale, sulfate scales, organic and biological foulants.
  • AWC® C-237
    Liquid high pH reverse osmosis membrane cleaner for removal of organics, biofilm, iron & various heavy metals.
  • AWC® C-238
    Neutral pH liquid RO membrane cleaning formulation for disintegration of gypsum scale.
  • AWC® C-239
    High pH liquid RO cleaning formulation specifically designed for removal of sulfate scales.
  • AWC® C-232
    Liquid low pH RO cleaning chemical for dissolution of tough organic scales such as calcium phosphonate, calcium polyacrylate & calcium citrate.
  • AWC® C-206
    Low pH powder reverse osmosis cleaning chemical for dissolution of carbonate & hydroxide scales.

AWC dechlorination chemicals have been specially formulated for long term shelf-life and are odor-free.  In addition to neutralizing free and combined chlorine to protect RO/NF membranes, they also deactivate all other oxidizing and non-oxidizing biocides; this makes them essential tools for environmental discharge.

  • AWC® DC-208
    Dechlorination chemical used to remove free & combined chlorine, to prevent oxidation and damage to the membranes. Does not emit toxic SO2 gas.