Use correct chemical dilutions
When diluting cleaners, take into consideration the total volume of water inside the technique which includes: tanks, pipes and/or hoses and vessels. Table 1 offers a guide to membrane vessel volumes.

Use proper flow rates
The velocity in the answer across the membrane surface is essential. Clean 4″ membranes at 10 to 12 gpm and 8″ membranes at 35 to 40 gpm. Full-fit membranes demand greater flow rates, 60 gpm for an 8″ element.

Always clean membranes in parallel
If required, separate the vessels to attain this. Never clean the vessels in series because it is difficult to make sure suitable flow rates and pressures.

Reduce cleaning pressure
Clean at pressures much less than 60 psig. This will minimize or get rid of foulants being pulled down for the membrane surface by water permeating during the cleaning process.

Heat the cleaning answer
Heat towards the maximum temperature permitted by the membrane manufacturer.

Further Tips

Use only DI or RO permeate water to dilute cleaning solutions.

Minimize cleaner foaming by placing return lines beneath the water level in the CIP tank.

Use a mixture of low and high pH cleaning solutions.

Recirculate the cleaning remedy for a minimal of 45 minutes.

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