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Thread: Sand filter sudden pressure drop

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    Sand filter sudden pressure drop

    Hi all

    Normal operating pressure, post backwash, is about 12-14 psi. This morning I noticed that the sand filter was reading 8 psi. I haven't backwashed in a couple of weeks (I don't get much debris).

    Any thoughts from the group as to why the pressure would drop suddenly like that?

    Cheers
    Tom
    20000 gallon, IG, SWG, Sand Filter, Hayward 1/2HP + Lorentz direct solsr PV pump

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    Join Date
    Aug 2013
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    Otsego, MN
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    Re: Sand filter sudden pressure drop

    Suction side clog? Pump impeller problem? Suction side valve closed too far?
    Pool/Equipment: 20'x52" round Intex Ultra Frame AGP (~8,800 gallons)--Intex SWCG (CG-28669, 15K gallon model)--Intex Sand Filter Pump (SF60110, 16", 120lbs sand, 3K gph)--Hayward SP1091LX Through-Wall Skimmer--Hard Plumbing--Taylor K-1766 Salt Test Kit--TF-100 Test Kit

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    Re: Sand filter sudden pressure drop

    Will double check, but I do not believe so. Return lines seem to be pushing water as normal....


    68,000litre, IG vinyl, LorentzPS 600 Solar Pump & 1/2 HP Tristar, Sandfilter, Aquarite T-15 SWG
    20000 gallon, IG, SWG, Sand Filter, Hayward 1/2HP + Lorentz direct solsr PV pump

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    AimeeH's Avatar
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    Apr 2012
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    Re: Sand filter sudden pressure drop

    If the return lines feel like normal pressure, I'd replace gauge before chasing ghost problems like clogs. Sure, there could be an issue but I've chased them myself for a week or more just to find out my gauge was going bad. It started reading low pressure for a long time. Then one day it was very high and didn't return to zero when pump was off. Replaced gauge and all was normal. I go through almost one a season.
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
    http://tftestkits.net/splash-page.html

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    Re: Sand filter sudden pressure drop

    What do you meqan "sudden"? 10 minutes? 10 days? Sounds like two weeks, is that correct?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Sand filter sudden pressure drop

    Quote Originally Posted by duraleigh View Post
    What do you meqan "sudden"? 10 minutes? 10 days? Sounds like two weeks, is that correct?
    Two weeks max....


    68,000litre, IG vinyl, LorentzPS 600 Solar Pump & 1/2 HP Tristar, Sandfilter, Aquarite T-15 SWG
    20000 gallon, IG, SWG, Sand Filter, Hayward 1/2HP + Lorentz direct solsr PV pump

  7. Back To Top    #7

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    Re: Sand filter sudden pressure drop

    I would check the pressure gauge. If water is being pushed normally into the pool, you do not have low pressure at the pump intake.....not much, anyway.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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