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Thread: DE Filter Cleaning

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    DE Filter Cleaning

    I am going to attempt to take apart my filter tomorrow and clean the grids for the first time. I have read the instructions and even saw video on you tube but I still feel uneasy about this for some reason. I have a Pentair FNS Plus Filter. Does anyone have one of these units, if so what is the best and easiest way to do this. All help is appreciated.

    Thanks ,

    20x41 Inground Vinyl, Pentair FNS Plus DE Filter, Pentair 1 HPWhispeflo, Interllichlor, Prowler 720

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    Join Date
    Jun 2010
    Dripping Springs, TX

    Re: DE Filter Cleaning

    I took apart my Hayward DE filter the other day for the first time. It wasn't the most fun thing I've ever done, but I did eventually get it back together. On mine, the filter elements are arranged in a spiral pattern, and one of them is "special". Just pay close attention to everything as you disassemble it.

    17K gallon IG freeform Pebble-Tec pool w/ raised spa/waterfall, Hayward 6020 DE filter, Tristar 1 HP circulation pump, Tristar 2.5 HP spa pump, Silencer 2hp blower, Aquarite SWG, Polaris 280 w/ booster pump, Hayward Universal H-Series 400K LPG heater, Ultrapure Ozonator 25, Aqualogic PS-8

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    Re: DE Filter Cleaning

    The amount of work depends on how far down you plan to disassemble the filter to clean. First of, it is as easy as it shows on the various videos you find on the web, just be careful with the fabric on the grids as to not tear them by brushing up against objects or rocks, etc. If the grids are not too clogged or scaled you may only need to do a spray down of the grids to clean off the DE. If the grids are really clogged and dirty that a spray down does not work, then you will need to do an acid wash. (which I have the pool store or someone else do)
    Once you get the top of the filter off on the Pentair, just pull the grids straight up and out of the filter body and place it on a pad, trap or grass. (there are hand hold on top of the filter) Try spraying it off first before thinking of disassembling the grids. If you can the grids to to come cleans (some what white looking) then you are good and can put the filter back in the filter body. Make sure to clean in between the filters to get all the DE out that is clogged in there. A good sprayer nozzle on the hose end will normally do the job. You will probably get wet and covered with DE if not careful.
    Once you have cleaned and put the grids back into the tank body, carefully seating the grids on the lower return pipe, you can put the top back on. Clean the tank o-ring and slather it with some silicone and place it back on the lower tank body before placing the top back on.
    The first time i did this operation myself, I was nervous also, but found out it was not hard at all. - go for it.
    15k gal, inground plaster, 15'x30', attached spa (w/spillover); Pentair FNS-48 DE filter(using Fiber Clear); w/1.5hp Whisperflo pump; gas heater (MiniMax 250); solar cover; location: El Paso,TX

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    Join Date
    Mar 2007
    Coastalish 'down easter'

    Re: DE Filter Cleaning

    See if this article from Pool School's Further Reading doesn't help
    Luv& Luk

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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