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Thread: DE coming back into Pool thru return and Polaris feed

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    DE coming back into Pool thru return and Polaris feed

    I had found DE in my pool. Had the tech come in. He first replaced the filter manifold and three or four grids. The problem still persisted. So, he reportedly changed some more grids. I am still seeing DE in pool. The screen at Polaris inlet gets clogged with DE and small trash very quickly. I backwashed the DE filter thinking it may have too much DE and then had the Polaris disconnected. Ran the pump(s). A lot of DE was visibly coming out of the Polaris inlet. I have also notices that at least two return into my pool spa have almost no water flow.

    1. Assuming that the tech fixed everything in the DE filter. What else be wrong? Or did he just miss some tears/ holes in some of the grids?
    2. Can the backwash valve be the problem? Why would DE come out to pool and from the Polaris water inlet especially after backwashing the DE filter?
    3. What could be wrong with the spa returns.

    Any advise is welcome.

    Thanks

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    Re: DE coming back into Pool thru return and Polaris feed

    What make and model of DE filter do you have?

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    Join Date
    Mar 2009
    Location
    Charlotte, NC
    Posts
    530

    Re: DE coming back into Pool thru return and Polaris feed

    Quote Originally Posted by KAMAL

    1. Assuming that the tech fixed everything in the DE filter. What else be wrong? Or did he just miss some tears/ holes in some of the grids? My 1st guess is that he missed some
    2. Can the backwash valve be the problem? Why would DE come out to pool and from the Polaris water inlet especially after backwashing the DE filter?
    3. What could be wrong with the spa returns.

    Thanks
    Some of the pros can help on # 2 & 3
    19,800 gallons (closed/winter 18,654 gal); plaster; 18x34 Ft kidney bean shape, Depth 3Ft-5Ft. Built 1992
    Pentair Whisper Flow Pump 1HP. Winter safety cover w anchors.
    Sand filter, Pentair Sand Dollar Top Mount Model SD80; Effective Filtration Area 3.5SF
    - FlowRate 75GPM, 8Hr 36,000, 10Hr 45,000, 12Hr 54,000; Pressure Weight 50PSI
    BBB (Hayward Chlorinator when leave town). Polaris 360 cleaner.

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    Re: DE coming back into Pool thru return and Polaris feed

    James ... I have Puyrex Triton FNS Plus 48 DE filter.

  5. Back To Top    #5

    Re: DE coming back into Pool thru return and Polaris feed

    I think that the filter needs to be disassembled and carefully rechecked.

    There might be a problem with the valve. It probably wouldn't hurt to disassemble it to check, clean and lubricate it.

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    jerrypar72's Avatar
    Join Date
    Nov 2007
    Location
    Phoenix
    Posts
    25

    Re: DE coming back into Pool thru return and Polaris feed

    Not sure if you are still having this problem. I had the same thing happening several years ago. After changing the grids and checking for air leaks in the system, I finally realized that the pump was drawing air into the filter from the skimmer. The air would accumulate in the top of the filter while the cleaning system was running, then it would "burp" back out into the pool through the main drain, causing DE powder to enter the pool. Turns out, this was caused by the water level being a bit low in the pool. I simply raised the water level and the problem went away!
    11,000 gallon Tahoe blue pebble tec, PCC 2000 in floor cleaning system, with two Pentair 1.7HP cleaning pumps, and a separate pump for water feature, Frog chlorinator, 60 SF DE Filter

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    Join Date
    Aug 2011
    Location
    Central Valley California
    Posts
    121

    Re: DE coming back into Pool thru return and Polaris feed

    I have the same DE filter and had the same problem before. I changed all the grids and the problem went away. Must have been a hole I couldn't see.
    23,000 gal IG Plaster 1989
    Purex Triton FNS Plus DE Filter Model FSNP 60
    1 Hp pump, Polaris 380 w/booster pump
    700 Gal Spa
    Laars Lite Heater T-F 100 Test Kit

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