Reverse osmosis membrane cleaners

Avista RoClean L211 alkaline cleaning reagent 20 kg

Artnumber: L211
Price Upon Request
Article: L211

Basic information

The RoClean™ L211 alkaline liquid low foaming cleaner is intended to remove silt, organic impurities, colloidal silica, clay, organic color and biological slime for spiral wound thin film membrane elements.  

RoClean™ L211 is highly buffered to resist pH changes during the cleaning process, and contains a blend of buffers, low foaming surfactants and chelants to dissolve organic foulants and disperse colloidal particles.  

Key advantages

  • contains a blend of buffers, low foaming surfactants and chelants to dissolve organic foulants and disperse colloidal particles

  • compatible with thin film polyamide and cellulose acetate membranes

  • NSF certified for use beyond installations of membranes for drinking water treatment

  • highly buffered to resist pH changes during the cleaning process

  • temperature compensated to maintain optimum pH over a wide temperature range

Main features

Appearance

amber liquid

2% solution pH

10.5-11.5

Relative density at 20°C

1.05-1.1

Packaging

20 kg pail


Contains alkaline reagents and low foaming surfactants intended to dissolve and separate colloidal particles, organic impurities, silicon deposits and biological slime from the surface of membrane.  

The buffer system of the reagent provides maintenance of required pH value during cleaning, as well as temperature compensation of pH for the most effective removal of deposits over a wide temperature range.

The proper composition of complexing agents significantly increases efficacy of silicon, iron, manganese and aluminium compounds removal, and prevents recurrent formation of the deposits of the dissolved impurities.



For effective cleaning, they prepare 2% solution of RoClean™ L211. In case of mild fouling of the membrane elements, or frequently performed process of cleaning, they use 1% solution of RoClean™ L211.

  1. Prepare a tank of required volume, and fill it with purified water. To intensify the cleaning, before mixing heat up RoClean™ L211 to 40°C. Add the calculated sufficient volume of RoClean™ L211 into the water, and mix the solution.

  2. The cleaning (the solution recirculation) is conducted for 60 minutes (minimum). Volume and temperature of the circulating cleaning solution, as well as pressure during the cleaning should correspond to the membrane elements manufacturer guidelines. The Avista Technologies company recommends the following values of the cleaning solution flowrate for the spiral wound membrane elements:

  3. Element diameter

    Flowrate, L/min

    4″

    38

    8″

    151

  4. The heavily fouled membrane elements have to be soaked in the cleaning solution for 8 hours.

  5. Monitor the pH of the solution during the cleaning process. If the pH level dropped lower than 10.5, prepare a new cleaning solution and repeat steps 1-4.

  6. When the cleaning is completed, rinse the membrane elements with water to wash the cleaning solution off them.