Servicing your Pure Water Products Countertop Reverse Osmosis Unit

Pure Water Products
940 382 3814

Countertop RO units are among the easiest drinking water systems to service. Usually it is merely a matter of changing the two or three filters (the number depends on the unit model you have). The membrane (in the long horizontal vessel on top of the unit--black in most cases) is changed with less frequency than the filters.

Membrane

The reverse osmosis membrane is best changed on need rather than time. To determine the need, you should have a TDS tester. Read the tap water, then water made by the RO unit. When the RO water reading begins to equal 15% or 20% of the tap water reading, it's time to change. IMPORTANT: Take your TDS test water from the unit before you change the filters. New filters give a high reading until they are thoroughly rinsed.

If you don't have a TDS tester, you should change the membrane at least with every third cartridge change.

Go here for specific membrane change instructions.

Filters

Filters should be replaced at least annually. The method of change depends on the style of unit.

For Style A units (with full-sized filter vessels), remove the sump of the vessel from the cap using the wrench provided. Remove the old cartridge, lubricate the O-Ring in the sump lightly with silicon grease or Vaseline, replace the cartridge, and retighten the sump. Don't over tighten. "Snug" is usually good enough. Note: Carbon block and sediment cartridges, with both ends open, have no top or bottom. Either way works. Axial cartridges (specialty cartridges, usually) with a plastic shell must be inserted with the small end toward the vessel cap. The arrow on the vessel should point toward the cap.

For Style B units with K or Gold Series inline filters, remove the old filters by releasing the John Guest fitting and removing the entire "plug-in elbow" from the old filter. With K Series (or with Gold Series with John Guest fittings installed), simply insert the new filter where the old one was. Read the label to determine direction of flow and to assure you are replacing the old filter with the correct new filter. For Gold Series without fittings, remove the fittings from the old filter, re-tape the threads (with 4 or 5 wraps of Teflon tape), and install the fittings into the new filter.

For Style C units with Q Series filters, just screw the old filter out of its cap and replace with new.

Startup

After the filters (and membrane, if you changed it) have been replaced, start the unit and operate it as usual. Let it run to drain for at least two hours before capturing the water for drinking.

Upon startup, air will be released from the new carbon for some time, so don't worry about the hissing and gurgling sounds. It will be a few minutes--perhaps 15 minutes or so--before product water begins to issue from the product line. This is because it takes time to fill the final filter vessel.

If there are questions or problems, don't hesitate to call: 940-382-3814.

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