RO418 is a liquid blend of sodium hydroxide and inorganic builders. Specifically developed as an alkaline cleaning formulation for removing organic matter and befouling from all types of membranes, it does not contain any amino carboxylic acid sequestrants.
RO418 must always be used as recommended by the membrane manufacture in respect of temperature and pH. Compatibility with all membrane types must not be assumed.
• Concentrated liquid product for ease of use.
• Effective cleaner, at low concentrations, for removing organic deposits from membranes.
• Has a wide range of applications and compatibility with many other cleaners.
Appearance : clear liquid
SG at 20C : 1.11
pH of 1.0% solution : 12.0
*All figures are approximate
Treatment and Dosage Requirements Before cleaning it is advisable to remove any alkaline scale deposition by treatment with RO401 or RO402 at pH 2.0 taking care not to exceed manufacturer's recommendations in terms of pH and temperature. Chlorine-free product water should be used to make up a 1.0 - 2.0% w/w solution of RO418 and a 0.2 – 0.5% solution of RO 414. The cleaning solution should be circulated through the elements for one hour at a temperature of 30C and the pH adjusted to 11.0 by the addition of more RO418. The flow rate should be as designated by the membrane manufacturer or equipment manufacturer. Soaking the membrane for 2 - 4 hours should be followed by 15 - 30 minutes recirculation. This sequence may have to be reported in the case of heavily fouled membranes, and it is recommended that the cleaning is carried out at the maximum temperature which the membrane manufacturer will allow. After the cleaning process the membranes should be rinsed with clean water to remove any residual RO418. When the plant is returned to duty product water should be discarded for at least 15 minutes.
Field Representatives will work closely with customer personnel to assure the effective application of the water treatment programme. Qualified personnel can provide regular service calls.