I have a cartridge filter and you are right, there is no multiport valve for the filter. There is a drain port at the bottom of the filter.
Re: Replacing water to get rid of CYA
I have a cartridge filter and you are right, there is no multiport valve for the filter. There is a drain port at the bottom of the filter.
Salinda
owner of ~35,000 gallon plaster IG pool/spa combo. Ikeric Dyna-Miser VS150 filter pump, 2 hp whisperflo spa jet pump, The Pool Cleaner 2x suction cleaner, Clean & Clear Plus 520 cartridge filter, Zodiac Clearwater LM2-40 SWG, Sta-rite 400k heater, solar heat pads and coils.
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