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Thread: Pressure question

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    flyinokra's Avatar
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    Pressure question

    I just changed the filter sand in my 25" filter with 300lbs of new pool filter sand. I back washed for about 5 or 6 mins and the water was nice and clear in the sight glass. I then rinsed for about 2 mins. So I then turned the pump off then to filter and turned the pump back on. I was expecting the pressure to be in the neighborhood of 12 PSI but it was 20 PSI. I changed the gauge when I changed the sand because the other one didn't work so I don't think it is the gauge. My question is is that to high or is that just where mine is going to be with clean sand?
    30K Gallon 40x20 IG vinyl liner
    1.5HP Hayward Super Pump, a 27" Hayward Pro sand filter and
    Aqua Rite T-15 SWG

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    Divin Dave's Avatar
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    Re: Pressure question

    did you turn it off and on a couple times? Flick the gauge with you knuckle and it still repeated at 20?

    If so, then thats prolly just where its at with the new sand.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    flyinokra's Avatar
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    Re: Pressure question

    Dave thats funny you should say that. I did turn it on and off a couple of times and tapped it with my screwdriver.
    30K Gallon 40x20 IG vinyl liner
    1.5HP Hayward Super Pump, a 27" Hayward Pro sand filter and
    Aqua Rite T-15 SWG

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    Divin Dave's Avatar
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    Re: Pressure question

    welp,
    there ya go then. The clean pressure is 20with your new sand.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    Re: Pressure question

    Any chance that your new sand is a smaller particle size than the old sand. Smaller grains will cause higher pressure, so that might explain it.
    IG W/Vinyl Liner Oval 18x40, 21K gal, Oval 3'-8'
    Pentair Intelliflo VS Pump, Sand Filter

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    Propbndr's Avatar
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    Re: Pressure question

    If you original gauge was not working, how do you know the new one is inaccurate? Did you install the new gauge first, run your filter, then change your sand? My filter, after backwash, runs at 18 psi and loves 20 (that is with the old sand and new sand after I changed it). I just let her run until it gets to 25 psi or so.
    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: Pressure question

    I have had different gauges over the yrs and they all seem to have a different benchmark reading.
    19,000 gal - Vinyl IG - Sand filter -1.5hp. - Taylor k 2006 - Loop Loc cover

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    Patrick_B's Avatar
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    Re: Pressure question

    Yea, that's just the problem. Some are better than others and none of them are extremely precise. While 20 seems a touch high, it really isn't wrong, its just what you have. But at least you know where you are. If it isn't one, a nice Glycerin filled gauge is good to have. They tend to be a bit better in terms of overall quality/accuracy.
    TFP Moderator
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    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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    flyinokra's Avatar
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    Re: Pressure question

    Thanks for the replies. It's my first pool and I'm just learning as I go.
    30K Gallon 40x20 IG vinyl liner
    1.5HP Hayward Super Pump, a 27" Hayward Pro sand filter and
    Aqua Rite T-15 SWG

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    Patrick_B's Avatar
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    Re: Pressure question

    Well, there is no shame in that. In fact, quite the opposite.

    Glad you found the forum, and it's good to have you with us.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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    Mod Squad pooldv's Avatar
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    Re: Pressure question

    Yep, welcome to TFP! Flyinokra! LOL. Need to fly some okra into a fryer and onto my plate!
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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