Technical Support
Feed Water Parameters & Operating Limits
The LWS Whole Home Point of Entry Reverse Osmosis Water Filtration System is designed to operate with a wide range of feed water; however, feed water should never fall outside of the parameters listed below.
Feed Water Operating Limits
| Parameter | Value | Metric Equivalent |
|---|---|---|
| Max. Working Inlet Pressure | 80 psig | (550 kPa) |
| Max. Working Pressure After Pump | 200 psig | (1370 kPa) |
| Min. Working Inlet Pressure | 35 psig | (241 kPa) |
| Min. / Max. Temperature | 35°–90° F | (1.67°–32° C) |
| Max. Feed Water pH | 9 | |
| Min. Feed Water pH | 6 | |
| Max. T.D.S. | 750 ppm | |
| Max. Input Free Chlorine | 4 ppm | |
| Max. Hardness | 30 gpg | |
| Max. Turbidity | 1 NTU | |
| Max. Feed Water Total Iron | 2.5 ppm |
Important Note
Combinations of TDS, Iron, Arsenic, Hardness, and other contaminants will change maximum specifications. If any of your water parameters fall outside of this range, a pre-filter system will be needed to pretreat the feed water to the LWS Water Appliance.
Conditions Requiring Pre-Treatment
The following feed water conditions fall outside safe operating parameters. If your source water meets any of these conditions, additional pre-treatment is required before installation.
Chlorine > 4 ppm
Optional Chlorine Filters available. Chlorine levels > 3 ppm will drastically reduce your Stage 2 filter capacity.
Chloramines > 4 ppm
Optional Chloramine Filters available. Chloramine levels > 3 ppm will drastically reduce your Stage 2 filter capacity.
Hardness > 30 gpg
Pre-treatment or water softening will be required before the LWS system.
Iron > 2.5 ppm
Levels over 2.5 ppm require an Iron Reduction System prior to the LWS Water Appliance.
TDS > 750 ppm
Feed water exceeding this level falls outside the designed operating range and may require additional pre-treatment.
Turbidity > 1 NTU
Higher turbidity indicates suspended solids that must be addressed with pre-filtration before reaching the RO membrane.
Surface Water
Surface water sources (rivers, lakes, ponds) require additional pre-treatment evaluation before use with an LWS system.