How a Multiport Valve Operates search text box. Contact ... cartridge, sand, and diatomaceous earth (DE). Sand and DE filters use a multiport valve primarily to help clean or backflush the filter media. ... pro grid 4020 DE filter. It has a slide valve that is always breaking. Should I replace it with a 4 or 6 position multi port valve? Reply
How a Multiport Valve Operates
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