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Thread: Sand filter leaking from flange clamp

  1. #1

    Sand filter leaking from flange clamp

    I have a Hayward S220T sand filter.

    I replaced my sand today and now I have two small streams of water coming out from the flange clamp, near where the two bolts are, that I can't seem to stop.

    I've cleaned the O-ring that's on the multi-valve, as well as the top of the filter. I'm confident it is a clean fit (no sand or debris).

    No matter what I do, it continues to leak. It's a steady stream, and about as wide as 3 toothpicks.

    Think I need a new O-ring?

    Has this happened to anyone else before? Filter is about 5 years old.
    Hayward S220T Sand Filter, Hayward Max-Flo 1 HP Pump, 14,000 Gal Vinyl Inground

  2. #2
    Senior Member
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    Re: Sand filter leaking from flange clamp

    Did you use a rubber mallet to help work the clamp on as you tightened it?
    18' Round ABG (8000 gallon)
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  3. #3
    Senior Member spishex's Avatar
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    Re: Sand filter leaking from flange clamp

    Did you lubricate the o-ring? At five years old, I'd suggest a new, well-lubricated o-ring so you don't have to worry about it again any time soon. The quick and dirty fix would be to use silicone sealant.

  4. #4

    Re: Sand filter leaking from flange clamp

    I used the rubber mallet trick last night. Thanks for the suggestion Wolfmarsh!

    It helped, but did not stop the leak. Instead of a steady stream, it's now more of a drip, but from the same spot.

    I think the O-rings are like $10, so I'll just grab another one on the way home today.

    Is there a special type of lubricant designed for this sort of thing that I should be using?

    Do you really "crank down" on the flange when tightening it? How tight should it be?
    Hayward S220T Sand Filter, Hayward Max-Flo 1 HP Pump, 14,000 Gal Vinyl Inground

  5. #5
    Senior Member spishex's Avatar
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    Re: Sand filter leaking from flange clamp

    With a well lubricated o-ring it doesn't need to be torqued like mad. With MPV clamps like yours I usually don't have to go more much more than hand tight. As long as the clamp is on snug enough to stop the valve from blowing off it's probably going to seal. Use a pool-use silicone or teflon lubricant (preferably the silicone stuff, like Magic Lube II). They'll have it at the store where you pick up the o-ring.

  6. #6

    Re: Sand filter leaking from flange clamp

    Quote Originally Posted by spishex
    With a well lubricated o-ring it doesn't need to be torqued like mad. With MPV clamps like yours I usually don't have to go more much more than hand tight. As long as the clamp is on snug enough to stop the valve from blowing off it's probably going to seal. Use a pool-use silicone or teflon lubricant (preferably the silicone stuff, like Magic Lube II). They'll have it at the store where you pick up the o-ring.
    That's good info. I was tightening like mad to get the seal.

    I'll update ya after I get the new O-ring and sealant.

    Thanks!!!
    Hayward S220T Sand Filter, Hayward Max-Flo 1 HP Pump, 14,000 Gal Vinyl Inground

  7. #7

    Re: Sand filter leaking from flange clamp

    OK, at first the new seal and Magic Lube didn't seem to make a difference. So I moved the collar to a 90-degree position, and it seems to have stopped the leak.

    I'm running the filter 24x7 now, but it will be interesting to watch how this holds up once it starts cycling once a day.


    Thanks for the help!
    Hayward S220T Sand Filter, Hayward Max-Flo 1 HP Pump, 14,000 Gal Vinyl Inground

  8. #8
    Senior Member spishex's Avatar
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    Re: Sand filter leaking from flange clamp

    Well done!

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