Below is a summary of the RoClean L403 cleaning procedure.
1. Fill the cleaning tank to the desired volume with reverse
osmosis (RO) permeate or deionized water. Heat the solution
to the maximum acceptable temperature (according to the
membrane manufacturer’s guidelines), as this will dramatically
increase cleaning efficiency. Add sufficient RoClean L403 to
create a 2% wt/wt solution if the fouling is moderate to severe
or a 1% wt/wt solution if the fouling is mild. Recirculate the
solution through the cleaning tank to ensure adequate mixing.
2. Run the cleaning solution through each RO system stage,
one at a time, for a minimum of 60 minutes at the flow rate
recommended by the membrane manufacturer. If that rate is
not known, use these guidelines:
3. At the beginning of the cleaning process allow 15% of the
initial cleaning solution to go to drain. If there is not enough
tank volume add 15% of the 1% or 2% cleaning solution.
If the membranes are heavily fouled and the cleaner has
extreme high color or suspended solids, rebatch the chemical.
4. Monitor the pH of the solution during the cleaning process.
If the pH remains in the desired range and the solution is not
turbid, it may be used to clean subsequent stages. In the
unlikely event that the pH rises, add more cleaner, or prepare a
new batch and repeat steps 1-4.
5. When cleaning is complete, rinse the membranes by
flushing RO permeate through each pressure vessel. The
system can then be returned to service.
