WP440L-Series Reverse Osmosis System
Installation Instructions and User Manual
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System Maintenance
Maintain proper operating conditions. (See section: “Design Basis” on pages 3-4)
Sediment Pre-Filter Cartridge
When to Change Sediment Prefilter Cartridge
Sediment cartridge Filters should be changed regularly to maintain proper pump pressure and flow. If the pressure drop
across the cartridge filter (as indicated by the differential between the filter inlet and filter outlet pressure gauges)
increases by 10 psi, the cartridge filters should be changed.
Changing Cartridge Filters
1. Turn unit off.
2. Close inlet supply valve.
3. Un-assemble the filter housing (twist the sump counter-clockwise).
4. Remove and inspect the cartridge. Replace as needed.
5. Before replacing housing, insure that O ring seal is lubed and placed in groove of housing. Inspect seal and replace
as needed.
6. Assemble housing (turn the sump clockwise into the cap until tight).
Illustration 13 - Sediment Prefilter Cartridge
Membrane Cleaning
In normal operation, the membrane in reverse osmosis elements can become fouled by mineral scale, biological matter,
and grime. These deposits build up during operation until they cause loss in water output or loss of salt rejection, or both.
Elements should be cleaned whenever the water output rate drops by 10 percent from its initial flow rate
(the flow
rate established during the first 24 to 48 hours of operation), or when salt content in the product water rises noticeably.
Note: Check water temperature and apply temperature correction (page 19) to determine if flow loss is
due to low feedwater temperature. A malfunction in the pretreatment, pressure control or pump can
cause a drop in feedwater delivery pressure, feedwater flow, or product water output, or an increase in
salt passage. If such adjustments are needed, the element may not require cleaning
.
When to Clean Membranes
