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Frequently asked questions

A direct flow system makes purified water on demand, without a storage tank. The Pallas EF500 in this collection is a direct flow system with a pump, rated at 500 gpd.

Size it by your peak and daily water demand, your feed water quality and temperature, and the pre-treatment already in place. Contact us with those details and we can help you choose.

Yes. Sediment and carbon pre-filtration protect the membrane from particles and chlorine, and hard water usually needs softening or scale control as well, because scale shortens membrane life.

Pre-filters are changed on a regular schedule, and the membrane is replaced when permeate quality or output falls. Replacement membranes such as the Spectrum PRO-4040 and WW-4040 are available in this collection.