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Thread: After Backwashing - water sprays from sand filter head

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    After Backwashing - water sprays from sand filter head

    I've been plagued with this problem for a long while, it's easy to reproduce.

    I switch my sand filter setting to backwash for a few minutes when necessary. I turn off power, switch it to Rinse and and then turn power back on, and now water will shoot from the head of my sand filter and the only way I can get it to stop is if I start opening and closing the different valves on the system while the problem is occurring and it relieves the pressure.

    So then Rinse is complete, I turn off power, I put it back to Filter and then the exact same problem happens and water shoots from the head, I play with valves (heater ones, Bottom drain) and problem stops until the next time I have to backwash.

    Help please.
    18' x 36" Ovalish 80,000 Litre Vinyl IGP. 2 speed 1HP Hayward pump SP2607X102S. 300 Pound Sand Filter. Summit Sum5 Heat Pump, Goldline Controls Aqua Logic P4 System, T-CELL-15 SWG, Aqua Pod Remote Control, Pentair 7845xx02 light.
    TF-100 Test Kit, SpeedStir Stirrer, Pool Chemist in training.

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    Re: After Backwashing - water sprays from sand filter head

    When you say "head", are you talking about the multi port valve?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: After Backwashing - water sprays from sand filter head

    Quote Originally Posted by duraleigh
    When you say "head", are you talking about the multi port valve?
    Sorry, yes, exactly.
    18' x 36" Ovalish 80,000 Litre Vinyl IGP. 2 speed 1HP Hayward pump SP2607X102S. 300 Pound Sand Filter. Summit Sum5 Heat Pump, Goldline Controls Aqua Logic P4 System, T-CELL-15 SWG, Aqua Pod Remote Control, Pentair 7845xx02 light.
    TF-100 Test Kit, SpeedStir Stirrer, Pool Chemist in training.

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    Re: After Backwashing - water sprays from sand filter head

    Yeah, time to shut off the pump and open up the multi-port. Pretty common for the gasket inside to be misaligned or damaged.

    Pretty easy DIY job if you're handy or get a service tech if you don't want to mess with it.

    As a note for everyone......I think it is good practice to turn your multi port handle in one direction only. If you start using it clockwise....only turn it clockwise....never back it up.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: After Backwashing - water sprays from sand filter head

    Quote Originally Posted by duraleigh
    Yeah, time to shut off the pump and open up the multi-port. Pretty common for the gasket inside to be misaligned or damaged.

    Pretty easy DIY job if you're handy or get a service tech if you don't want to mess with it.

    As a note for everyone......I think it is good practice to turn your multi port handle in one direction only. If you start using it clockwise....only turn it clockwise....never back it up.
    Thank you, I certainly did not practice a clockwise motion only, I will going forward.

    I have been been meaning to have my plumbing upgraded to 2" and I even bought a 2" multi port in anticipation, I guess I have an excuse to get a service call now.

    Just curious, but why does changing the pressure on the valves on other parts of plumbing resolve the issue, is there any combination of valve opening / closing I can do to fix it in a manual manner without getting everything wet until I get someone out?
    18' x 36" Ovalish 80,000 Litre Vinyl IGP. 2 speed 1HP Hayward pump SP2607X102S. 300 Pound Sand Filter. Summit Sum5 Heat Pump, Goldline Controls Aqua Logic P4 System, T-CELL-15 SWG, Aqua Pod Remote Control, Pentair 7845xx02 light.
    TF-100 Test Kit, SpeedStir Stirrer, Pool Chemist in training.

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    Re: After Backwashing - water sprays from sand filter head

    is there any combination of valve opening / closing I can do to fix it in a manual manner without getting everything wet until I get someone out?
    This is just a WAG, but I suspect by changing the valve positions you are changing the internal pressure and flow on the multi port, perhaps causing the gasket to reseat itself.

    I would urge you to consider that opinion worth exactly what you paid for it....it is strictly a guess.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: After Backwashing - water sprays from sand filter head

    This happened to me once and it freaked me out

    I tightened the screws on the clamp that holds the multi-port valve on and have never experienced it again.
    18 X 36, 29 K gallon, Sand Filter, Inground Vinyl Lined, 3/4 HP pump

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