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The 150 gpd membranes require a higher feedwater pressure than 100 gpd and lower membranes. Here's a table that might be of interest:...
The purpose of a permeate pump is to relieve back pressure on the membrane created by a pressurized storage tank. This improves the rejection...
Here are some things to look for in a good system for this hobby: No more than 4 stages (sediment, carbon, RO, DI) unless you have specific...