new cartridge filter not filtering

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f18fdg

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Oct 5, 2007
31
I just installed a Pentair Clean and Clear 420 filter and it does not seem to be filtering, the water remains cloudy. I opened up the filter and made sure everything was sitting properly. I must admit that the pool is very cloudy since I wasn't able to clean it while I was installing all new pool equipment. So I had a lot of algae and dirt which I took care of by shocking the pool and using Algaeside. So now I have a bunch of dead algae that does not get trapped by the new filter.

A PB told me that I can add some DE to the filter to help it, does this sound correct, if so how much.

I bought this filter because I did not want to deal with DE, my old filter was a DE filter.

Thanks
 
A cartridge filter can take a couple of days to clear up cloudy water. DE filters are often much faster than that. You may have simply not given it enough time. You should see some visible improvement each day, but it won't be clear for a couple of days.

Less likely possibilities include an improperly seated cartridge allowing water to go through without going through the cartridge, if you have a multi-port valve it might not be in filter mode, cloudiness from sources other than algae that are too fine to filter out, or maybe the algae isn't all dead.

I wouldn't normally add DE to a cartridge filter. The only case in which adding DE could possibly help is if the cloudiness is from very fine particles that get through the cartridge and that doesn't seem like the most probable cause. Plus adding DE can shorten the life of the cartridge.
 
I know in the clean an clear series (not sure about the multi cart clean and clear plus series) Pentair recommends adding DE to the filter ON FIRST STARTUP ONLY. Check the manual and see what it says.
 
when i opened my pool it was very cloudy, but not full of the green stuff. but even with pool clearer and the filter running 24/7 it still took about 4 days for it to clear, but that was with a sand filter, but i read that a cart filter, filtered the same amount as a sand filter. so i would guess it would be the same, but i also had a lot more water to filter. FWIW
 
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