AmeriWater 00HRO64800, Operation & Maintenance Manual

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2.2 FEED WATER REQUIREMENTS
The quality of the feed water to the reverse osmosis unit must meet the following
requirements:
- Hardness, max ........................................................................ . 0.5grains
- Free Chlorine, max ................................................................... 0.01 ppm
- Turbidity, max ................................................................................ 1 NTU
- Silt Density Index (SDI), max ................................................................. 5
Hardness : If the feed water exceeds 0.5 grains, use a softener to reduce the
hardness.
Free Chlorine : If the feed water exceeds the free chlorine limit, remove the chlorine
with a carbon filter. Chlorine is destructive to RO membranes.
Particulates : The feed water should always be processed through an inlet filter of no
greater than 5 microns to remove any particles or silt that may
potentially clog the membranes.