Avista - RoClean L211 High pH Liquid Membrane Cleaner

Brand: Avista

RoClean L211 High pH Liquid Membrane Cleaner

High pH low foaming liquid cleaner for colloidal silica, clay and organic foulants.

RoClean L211 is a high pH liquid cleaner formulated to remove colloidal material, clay, organics and organic foulants from reverse osmosis and nanofiltration membranes. It uses a proprietary blend of dispersants, low foaming surfactants and chelants, and is highly buffered to resist pH change during cleaning. It is particularly effective on humic and fulvic organics arising in surface waters, and is suitable for nanofiltration and other membranes with lower cleaning pH limits.

RoClean L211 is commonly used as a maintenance cleaner for scheduled cleaning, being highly effective yet gentle enough for daily application where required. Fill the cleaning tank with RO permeate or deionized water and heat to the maximum temperature acceptable under the membrane manufacturer guidelines. Add enough L211 for a 2 percent solution by weight for moderate to severe fouling or 1 percent for mild fouling. Run through each stage individually for at least 60 minutes, with an optional soak of up to 8 hours, then flush each pressure vessel with RO permeate.

Available Options

• 5 Gallon Pail (45 lb) (Item RT0045-5)
• 55 Gallon Drum (500 lb) (Item RT0045-55)

Key Features

• High pH alkaline cleaner: use solution pH 10.5 to 11.5 at 2 percent, 20 C
• Targets colloidal silica, clay, organic color and bioslime, plus humic and fulvic organics
• Appearance clear to amber liquid; specific gravity 1.05 to 1.2; complete water solubility
• Freeze point 14 F (below -10 C)
• Low foaming surfactant package with dispersants and chelants
• Suitable for nanofiltration and other membranes with lower cleaning pH limits
• Gentle enough for scheduled or daily maintenance cleaning
• NSF certified for use as an off-line cleaner in systems producing potable water
• Viton is not recommended with this product, unlike the RoClean powders
• Highly buffered to resist pH change during the cleaning cycle
• Recirculate a minimum of 60 minutes per stage; heavily fouled elements may soak up to 8 hours
• Recirculation flow per vessel: 10 gpm (2.4 m3/hr) for 4 inch elements, 40 gpm (9.0 m3/hr) for 8 inch elements
• Compatible with polyamide membranes from all membrane manufacturers
• Mix with RO permeate or deionized water heated to the maximum temperature allowed by the membrane manufacturer
• Unopened shelf life 12 months when stored between 45 and 100 F (7 to 35 C)
• Aluminum, brass, copper and mild steel are not recommended for use with this product

Ideal Applications

• Scheduled maintenance CIP on surface water RO with humic and fulvic loading
• Colloidal silica and clay fouling where a liquid cleaner is preferred
• Nanofiltration and membranes with restricted upper cleaning pH limits
• Bioslime and organic color removal on seawater, brackish or wastewater systems