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Thread: Question about filter pressure gauge

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    Seanhan's Avatar
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    Question about filter pressure gauge

    I just had a new Raypak heater installed and a check valve becuse i have a salt cell.
    Now my filter ( 1 year old hayward 72 sq ft ) pressure gauge stays at ten when i turn off the pump.
    If i open the relief valve ( top of filter ) it sucks air in and the gauge will go to zero.
    Is this correct operation .
    As long as i can remember the gauge has always went to zero with pump off.

    Is my gauge bad ? Or did the old leaky heater let air out?
    Thanks for any advice...
    Sean Hannon
    30,000 Gallons gunite pool Coated by Fibertech
    Hayward Pro Grid 72 / Hayward multiport
    Circupool V3 VS pump
    CirCupool SWG RJ 60, 400.000 btu raypak , Built in SPA

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    Re: Question about filter pressure gauge

    I'm no expert. But when we opened our pool this year our gauge stayed up when the pump went off. Our gauge was bad. We had to get a new one.
    Sand filter
    Salt Generator
    25000 gallon IG Vinyl

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    Propbndr's Avatar
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    Re: Question about filter pressure gauge

    What was the running pressure before your heater was installed?

    What is it now?

    How high above the rest of your system is the heater system?

    Do you have a bypass valve for the heater at the level of the filter?

    If so, put the heater system in bypass and test again. I suspect there is enough back pressure in the heater to seal the check valve and not allow the pressure in your filter to bleed down. If the test shows the pressure immediately goes to 0, that is the answer to your question.

    In the over all scheme of things 10 psi is not much pressure and should not be a problem until you try to open the filter itself. If your filter cap is 8" in diameter, with a static pressure of 10psi, the over all pressure seen by the cap is 500 pounds. (Area of the cap in square inches X the static psi.). With that type of pressure, the chances of opening the filter are between 0 and none.
    Steve
    32 X 16 inground, 17260 gallons, Vinyl Liner, Triton II TR-60 filter,
    Sta-Rite 1hp pump Model #MPRA6E-147L, CircuPool SI-30 Plus SWG, TF-100 Test Kit

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    Re: Question about filter pressure gauge

    Great answer Propbndr.
    Hayward Pool Tech
    80+ Years of Technologically Advanced Pool Product Manufacturing
    poolside@haywardnet.com

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    mas985's Avatar
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    Re: Question about filter pressure gauge

    Quote Originally Posted by Seanhan View Post
    Now my filter ( 1 year old hayward 72 sq ft ) pressure gauge stays at ten when i turn off the pump.
    If i open the relief valve ( top of filter ) it sucks air in and the gauge will go to zero.
    Is this correct operation .
    If you have positive pressure in the filter and you open the pressure relief valve, water should come out, not air get sucked in. Also, a filter should never maintain any pressure when the pump is off. There should always be a path to relieve the pressure out of the returns.

    However, it is normal for a filter to suck in air when the pressure relief valve is opened with the pump off if the filter is installed above water level. This is just the water draining out of the filter.

    Probably a bad gauge. When the pump is shut off, tap the gauge. When gauges get old, they sometimes stick.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Seanhan's Avatar
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    Re: Question about filter pressure gauge

    New gadge will be here tomorrow.
    i never have had a Gadge fail ( in the last 20 years )
    Sean Hannon
    30,000 Gallons gunite pool Coated by Fibertech
    Hayward Pro Grid 72 / Hayward multiport
    Circupool V3 VS pump
    CirCupool SWG RJ 60, 400.000 btu raypak , Built in SPA

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    Seanhan's Avatar
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    Re: Question about filter pressure gauge

    That was it !!! Bad gadge ... Only about 2 years old!!!! Let me guess bet the salt got to it ??

    My caretaker 99 in floor valve is supposed to be approved for salt use, every year the metal shafts that hold the gears rust up bad enough to stop it. Have to get a rebuild kit every year!!!
    Sean Hannon
    30,000 Gallons gunite pool Coated by Fibertech
    Hayward Pro Grid 72 / Hayward multiport
    Circupool V3 VS pump
    CirCupool SWG RJ 60, 400.000 btu raypak , Built in SPA

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    Re: Question about filter pressure gauge

    Well, at least it's a cheap fix! We just went thru that. Got one at Lowe's for less than $10.
    Sand filter
    Salt Generator
    25000 gallon IG Vinyl

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    Mod Squad jblizzle's Avatar
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    Re: Question about filter pressure gauge

    Quote Originally Posted by Rere View Post
    Well, at least it's a cheap fix! We just went thru that. Got one at Lowe's for less than $10.
    But the ones from tftestkits are bigger and nicer for the same price as what you likely got at Lowes
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Seanhan's Avatar
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    Re: Question about filter pressure gauge

    Yea iam gonna get one from tF next time i order Regents.
    i ordered the same Hayward one I had, the one with the 2 extra neadles to tell you when to clean filter.
    Amazon 15.00 "...... Wonder if it will last longer than 2 years ?
    Sean Hannon
    30,000 Gallons gunite pool Coated by Fibertech
    Hayward Pro Grid 72 / Hayward multiport
    Circupool V3 VS pump
    CirCupool SWG RJ 60, 400.000 btu raypak , Built in SPA

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    Mod Squad jblizzle's Avatar
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    Re: Question about filter pressure gauge

    But the needles are stuck at a 10psi rise right? Which is not when we recommend to clean filters. Although I guess at least that lets you mark the clean pressure instead of having to write it down or remember it.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Question about filter pressure gauge

    Bought a gauge from TFP.net two years ago. MUCH better than the one I got at Lowes and MUCH larger dial. Just my $.02... Sami
    16,000 IG, SWG, 175 sq. ft. cartridge, 1.5 hp pump, vinyl, Charlotte NC
    TF-100, Pool School, Pool-Calc

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