How Your Appliance Works
Your WaterMax® Drinking Water Appliance has been designed as a complete, self-contained appliance using
three stages of primary filtration and separation. The frequency in which membranes and filters should be
replaced depends upon the quality of the water that enters the appliance (feed water).
Meeting operational maintenance and replacement requirements are essential for this appliance to perform to
specification. Contact your local dealer for replacement filters and parts, or contact Hague Quality Water
International for the dealer nearest you.

First Stage–The Pre-Filters

Your RO appliance uses one or more pre-filters to remove impurities before the feed water reaches the reverse
osmosis membrane.
Pre-Filter Model Number Function
Sediment H2000, H2500, H3000,
LC30, LC50, LC100
Removes suspended and particulate matter 5 microns or larger
from the incoming tap water to protect the RO membrane and
any Carbon Pre-Filter from clogging
Carbon H3000, LC30, LC50,
LC100
Removes free chlorine from the feed water and protects the
membrane from chlorine degradation
Dual-Function
(combination sediment and
carbon)
H3500, LC50P LC100P Protects the membrane from clogging and chlorine degradation

Sediment Pre-Filter Maintenance—Models H2000, H2500, H3000, LC30,

LC50 and LC100

If you are using softened water, replace your Sediment Pre-Filter annually. If you are not using softened water,
the replacement interval will vary. Every six months, schedule an inspection and replace the Sediment
Pre-Filter as necessary. If you notice a discoloration in the core (center) of the Sediment Pre-Filter and/or a
heavy accumulation of sediment on the surface of the Sediment Pre-Filter, then replacement is necessary. The
maximum recommended practical service life of the Sediment Pre-Filter is one year. The pre-filter is overdue
for change when you notice reduced water production or a slower rate of flow.
Note: The Sediment Pre-Filter performance has not been tested or certified by WQA.

Carbon Pre-Filter Maintenance—Models H3000, LC30, LC50, and LC100

Changing the Carbon Pre-Filter should be based on the free chlorine levels in the feed water. If the free
chlorine is 1 ppm or less, then the Carbon Pre-Filter should be replaced once a year. If the free chlorine level is
greater than 1 ppm, then the Carbon Pre-Filter should be replaced every six months.
Note: Models H3000, H3500, and LC30 also incorporate a special prolonged contact filter that further reduces
chlorine and organics from your water supply.

Dual-Function Pre-Filter Maintenance—Models H3500, LC50P and LC100P

Follow the same maintenance procedures as for the Sediment Pre-Filter.
WaterMax RO Owner’s Manual 11/11/2009 8