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Thread: DE blowing back via returns

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    Join Date
    Jul 2015
    Location
    Smithtown NY
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    7

    DE blowing back via returns

    We presently have two problems going on with our pool. The DE blowing back into the pool is the more important of the two. When the filter turns on, the earth blows very heavily from one return line and a little from the other. It last a 45 seconds or so. This happens when ever the pump is turned off, whether for 8 hours or 5 minutes. We have replaced ALL the grids with unicel grids, we have replaced all O-rings and we have replaced the multiport valve. My husband is ready to buy a new filter (this one is @7 years old), but I thought I'd inquire here before potentially wasting money. There are no visible cracks in the manifold or the outlet elbow. I am thinking of replacing each of them next. What else could it possibly be??
    The second problem that I am not worried about right now is a suction side air leak, all gaskets and O-rings again have been replaced and well lubed with Magic Lube. We removed the heat pump from the system which was likely to be 95% of the problem but still not 100% fixed. Right now the DE is the biggest problem. I'd like to fix it before the summer is gone. Thank you for your help.
    20x40 Lazy L Vinyl IGP, Hayward DE4820, Jacuzzi Pump, (don't recall motor at this time) Hayward inline chlorinator.

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    chiefwej's Avatar
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    Jun 2011
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    Tucson
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    2,853

    Re: DE blowing back via returns

    Does this happen ever time the pump is turned on or just after you have cleaned the filter?

    I once had a similar problem, where just a puff of DE came out every time the pump started. It was solved by replacing a failed check valve between the pump and filter. It was allowing DE to flood back through the pump and fill the suction line, every time the pump was shut down.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Join Date
    Jan 2014
    Location
    Buckeye AZ
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    807

    Re: DE blowing back via returns

    have you tried the multiport in various positions to see if the DE is blown to waste on startup, or anything like that?
    10,500 gal IG, Topaz Pebble, auto-level
    Hayward DE filter, 2HP Ecostar VSP, ProLogic PS-4, GVA actuators
    Cal Pools Wave Force Plus (wall return jets plus 2 floor pop-ups), Venturi Skimmer
    Water sheer, 2 wok pots, bubbler stem on the baja step
    ColorLogic Mutlicolor LED lamp. Taylor 2006+speed stir

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    Inflatableman1's Avatar
    Join Date
    Jun 2015
    Location
    Playa Coronado/Panama
    Posts
    62

    Re: DE blowing back via returns

    The de has to pass through the system to come out of a return. So I think what Chief has mentioned would result in de at the skimmer or suction.

    If The manifold is fine, perhaps the mesh on one of your grids is damaged? When the pump is off and fluid level falls in the filter canister, it maybe draws a little de thru??


    Ryan
    41' x 16' x 5' IG, 25 000 gallon, cement, tile w/epoxy grout. Overflow/negative edge style. Pentair 4048 DE, Hayward 2 hp Single Speed, Pentair 320 Auto Chlorinator, 1.5 hp Blower f/Jacuzzi, TF-100, city/well (in pool) water option. Located in Panama.

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    In the Industry

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    Jun 2015
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    Wildomar, California
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    423

    Re: DE blowing back via returns

    There has to be a hole somewhere in a grid, the manifold, or less probably, the multiport valve. A wild guess: does your filter have a air tube with a screen fitting on top? Sometimes that small screen or the entire piece is missing, which allows de to return through to the pool.

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    Join Date
    Jul 2015
    Location
    Smithtown NY
    Posts
    7

    Re: DE blowing back via returns

    Thanks for all the suggestions and input. I ordered a new manifold which comes with the air tube. Although I can not see any cracks, maybe when it's under pressure when it first starts up a crack is allowing earth to pass through? Then when the pressure equalizes it stops... Part should be here tomorrow, keeping my fingers crossed. Thanks again everyone.
    20x40 Lazy L Vinyl IGP, Hayward DE4820, Jacuzzi Pump, (don't recall motor at this time) Hayward inline chlorinator.

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