Large selection of replacement water filters, reverse osmosis membranes, testing kits and water filter system repair parts. From one water filter or membrane to case quantity discounts.

LOW PRICES and FAST SHIPPING ONLINE SINCE 1999 !

99.5% Of All Items In Stock For Same Day Shipping!

Hague Water Filters ®

Hague Water Filters ®

Hague Performance Compatible Replacement Water Filters & TFC Reverse Osmosis Membranes

Hague 5 Stage Reverse Osmosis System

5 Stage System - 3 vertical filter housings, one top mounted horizontal inline GAC carbon post filter and one top mounted standard size

horizontal RO membrane housing. The system uses quick connectors at all connection points. See how to use quick connectors.


The Hague H3500 Reverse Osmosis system uses the same filters as the 5 stage system, but with one less carbon block prefilter.

  1. Aquatec Permeate Pump ERP-1000 For RO Reverse Osmosis Drinking Water Systems
    Aquatec ® Permeate Pump ERP-1000
    Aquatec ® Permeate Pump - The Aquatec ERP-1000 permeate pump is a turbine pump that uses the pressure of the waste water to pump the product drinking water into the storage tank. This protects the membrane from the back flow pressure of the tank, maintaining maximum osmotic pressure at all times. Great for low pressure applications. • Increases product water purity • Increases pressure and flow to the faucet • Saves up to 3/4 of inlet water • Up to 30% more tank pressure • Faster tank refill recovery • Increases filter and membrane life • Requires no electricity • Mounting Clip Supplied. Order the optional auto shut off valve that triggers at 90 percent rather than the standard 66 percent of tank pressure versus incoming line pressure. While the permeate pump works fine with a standard 66 percent auto shut off valve, the 90 percent valve increases storage capacity of the tank and increases initial pressure from the faucet. Will not install on most manifold systems such as Hydtrotech and Water Factory.
    Learn More
    $99.99 Special Price $69.99 As low as $55.99

Easy TDS Membrane Performance Calculator
See If It is Time To Replace Your Membrane

Simply enter your Feed Water TDS and RO Water TDS into the boxes above and click "Submit". The percentage of TDS Rejection will be displayed. We normally recommend membrane replacement once you drop below 75%. This may vary in areas with high TDS in the feed water.

See our selection of TDS meters under Water Tests


Be sure to check our Parts Department for important parts such as TDS Testers For Reverse Osmosis Membranes, Replacement Tanks, O-rings , Filter Housing Wrenches, Faucets, Pumps, Fittings, UV Systems and more parts for your reverse osmosis pure water filtration system.   View maintenance and servicing tips online at our Installation & Trouble shooting Guide.


* Hague ® is the registered trademark of Hague, the manufacturer of Hague ® brand water treatment equipment.  The replacement filters and membranes listed above are not manufactured or endorsed by Hague.  Rather, these filters and membranes are manufactured by other companies.  While these filters and membranes are compatible for use in Hague ® brand water treatment equipment, we make no representation as to whether using these filters and membranes is consistent with the warranty and specifications applicable to Hague ® equipment.