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Thread: Sand Filter Leak

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    Join Date
    Jan 2013
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    Australia
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    Sand Filter Leak

    Hi All

    My sand filter has developed a slow seeping leak when the pump runs from the insert unit that the barrel union threads onto. The leaking fitting is on the pool return outlet of the multiport, the filter is a Davey Crystal Clear 25 inch. I have disconnected the barrel union and then unscrewed the coupling/insert, on inspection it looks ok so I removed the thread tape and reapplied prior to refitment.

    I am surprised that there is no o-ring or any other such gasket/sealer but the Davey manual confirms that its only thread tape that is used to create the seal of the threads. I have tried tightening up the fitting a bit more with a wrench but it still has that slow seeping leak there. The internal threads on the multiport look ok, I was contemplating that the thread tape may be forcing gaps in the thread at pressure but without tape the fit is pretty loose.

    Can anyone suggest something else to try?
    Fibreglass 18000L pool, Viron P320 pump, Davey 25" sand filter, Viron EQ25 SWG with ORP and Acid dosing.

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    Mod Squad JohnT's Avatar
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    Re: Sand Filter Leak

    Do you have a picture of where it is leaking?

    I've personally had better luck on large fittings using pipe dope instead of tape. Make sure you use the type intended for plastic threads or it can crack fittings.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    duraleigh's Avatar
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    Re: Sand Filter Leak

    +1 what John said. My experience has been that pipe dope seems a little better for anything 1.5" or more.

    Try it......if it works, it's a cheap fix.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Sand Filter Leak

    Thanks for replying JohnT and duraleigh.

    After further investigation it turns out to be the recent installation of a new chlorinator, I had an Astral EQ with PH & ORP probes professionally installed (only way they will sell them over here in Australia). The 'professional' had too much length on the pipe coming from the sand filter pool return, he then installed the cell too high above said port. Basically the weight of the water and leverage applied on the fitting must have been causing a small gap in the thread which in turn leaked when under pressure.

    I didn't like the way he had installed the cell and the sensing chamber was put in vertical instead of horizontal as per the install manual, so I redid it according to manual and shorter length/height (like a normal install would look) and the leak from the fitting has disappeared. Unexpected but very happy all round with result.

    cheers
    Fibreglass 18000L pool, Viron P320 pump, Davey 25" sand filter, Viron EQ25 SWG with ORP and Acid dosing.

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    Mod Squad woodyp's Avatar
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    Re: Sand Filter Leak

    Nothing like having something done "professionally". Hope that solves your issue.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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