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Thread: Sand filter question

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    Sand filter question

    So I backwashed for the first time this season and noticed the pressure isn't going down. When the pool was first put in, the pressure was 12 psi in 2008. I would wait until the pressure would build up to about 16, then backwash (and rinse). and it would go down to around 13. This year, the pressure started out around 18 psi, and when I backwashed (and rinsed), the pressure stayed the same. The instruction manual says that if you backwash and the pressure doesn't go down 4-6 psi, then you should replace sand. It also says that you should backwash when the pressure gets up to 10 psi more than the starting pressure, which it hasn't yet. What should I do?
    20,000 gal oval IG, vinyl liner. 1 HP Pentair Superflo pump. Intellichlor ic20 SWCG with easy touch, Sand Dollar SD80 sand filter, Taylor K-2006 test kit.

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    Mod Squad Bama Rambler's Avatar
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    Re: Sand filter question

    Does your pressure gauge go to zero when you stop the pump?

    Those gauges are cheap and prone to failure. I'd just replace it first just to be sure you're really seeing those pressures.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Sand filter question

    The gauge goes to zero when I turn the filter off. Does that mean the gauge isn't broken?
    20,000 gal oval IG, vinyl liner. 1 HP Pentair Superflo pump. Intellichlor ic20 SWCG with easy touch, Sand Dollar SD80 sand filter, Taylor K-2006 test kit.

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    Mod Squad Bama Rambler's Avatar
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    Re: Sand filter question

    It's a good indicator that the gauge is ok but it could be bad.

    How did the water look coming out of the waste line when you backwashed?
    How long did it take the backwash to clear up?

    Have you replaced the eyeball?
    Is there a valve partially closed in the return line?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Sand filter question

    Quote Originally Posted by Bama Rambler
    It's a good indicator that the gauge is ok but it could be bad.

    How did the water look coming out of the waste line when you backwashed?
    How long did it take the backwash to clear up?

    Have you replaced the eyeball?
    Is there a valve partially closed in the return line?
    Questions answered in order:

    I never looked at the water that comes out.

    Don't know

    what's an eyeball?

    No.

    Are all gauges for sand filters universal, or should I get the gauge that pentair sells?
    20,000 gal oval IG, vinyl liner. 1 HP Pentair Superflo pump. Intellichlor ic20 SWCG with easy touch, Sand Dollar SD80 sand filter, Taylor K-2006 test kit.

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    Re: Sand filter question

    As far as I know all filter gauges sold at pool stores are universal. I just replaced mine. Got the new one at the pool store - cost $6.15
    Larry in Texas

    Above ground 7,700 gallons, 19 inch sand filter ( 2 sq. ft.), Liquidator, and a WaterWay Hi-Flo Pump with an A.O. Smith 1 hp SF 1.0 motor.

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