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Thread: Pressure Gauge questions

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    appstategrad's Avatar
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    Pressure Gauge questions

    My 3 yr old pressure gauge is slow to rise when the pump is first turned on and slow to fall when it is turned off (but it does eventually go back to zero when off.) After a minute or so it gets to where I would expect the pressure to be, is consistent, and I have movement through the returns. Vacuuming is fine. I suspect the gauge is bad, but is there anything else I should check before I order a new one? I took it off and cleaned inside it and inside the filter fitting with a straw cleaner brush...no change.

    Are "off-brand" gauges as good as a name brand or should I stick with a name brand (Hayward is what i have now)? I don't have a preference to buy one over the other, but an off brand doesn't save money if you buy it twice as often or it doesn't work as well. If you have had good experience with an off-brand, what was the name?

    Thanks!

    ~ 18.5' x 36.5' inground Grecian pool with vinyl liner
    ~ approximately 23,000 gallons
    ~ AquaRite Salt Water Generator cell size t-9
    ~ 1.5 HP Hayward Pump and Hayward Sand Filter
    ~ TF-100 test kit

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    Re: Pressure Gauge questions

    I've experience with several gauges including the better glycerine filled gauges. They all seem to last me about a year. My last purchase was a $6 gauge at the local pool store so I bought 2. I do leave the gauges on in winter which may contribute to their short life but bad pressure readings have had me chasing false problems so I keep a spare on hand now.
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
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    Re: Pressure Gauge questions

    These fail often. Heck mine has been broken for years. Many times that aren't very accurate but can tell you if and when the pressure has gone up 10 PSI since you cleaned last.

    As long as it will fit you generally can use it. I've even used one from the big box home improvement stores. Might be slightly cheaper than a pool supply place.
    Paul
    http://www.gastekservices.com A word of caution: When working with gas and electrical you might want to consider a licensed contractor. Consider the value of your life and others around you. If you would like to provide a review of the help I provided, please use the following link to leave a review. gastek - Google Search,

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    Re: Pressure Gauge questions

    I've had my glycerine filled gauge that works well for two seasons now. They tend to be much more stable and reliable than standard air filled gauges. I bought mine at tftestkits, TFTestkits.net, but any glycerine filled gauge should work well and be better than a standard gauge.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
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    Re: Pressure Gauge questions

    Thanks for the input! AimeeH and JVTrain I didn't realize there was a difference or that I should look for one that specifically said "glycerine filled"...I just searched for something along the lines of "pool sand filter gauge". Seems like they are all about a 1/4" fitting.

    ~ 18.5' x 36.5' inground Grecian pool with vinyl liner
    ~ approximately 23,000 gallons
    ~ AquaRite Salt Water Generator cell size t-9
    ~ 1.5 HP Hayward Pump and Hayward Sand Filter
    ~ TF-100 test kit

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    Divin Dave's Avatar
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    Re: Pressure Gauge questions

    THe gauge available on TFP is the bomb. Im going on 2.5 years with it and it still looks like it did the day I got it. Its extremely well built, is much easier to read. IMO, it's worth way more than the asking price for it.
    DSCN0627.jpg
    DSCN0628.jpg
    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 Gauge questions

    One thing to check before replacing the gauge is to unscrew it and see if there is a visible clog blocking the inlet.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

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    Re: Pressure Gauge questions

    Another vote for the glycerine filled gauges, I'm on my second season with the one I purchased from TFTestkits.net, works like the day I bought it, and the price can't be beat. I especially like the equalizing valve on the gauge!
    Dom - TFP Guide
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    Re: Pressure Gauge questions

    Glycerin filled gauges use the glycerin to reduce the effects of pulsation in the monitored line. It is unlikely that many centrifugal pool pumps will see such pulsation under normal use. The biggest gauge killer is leaving them on over the winter. Once the bourdon tube is full of water (the glycerin only fills the case and surrounds the gauge works) there is nothing to displace it and allow the water to drain out. Air that might have originally been in the gauge at installation will be absorbed into the water and be replaced with the water. Ice then breaks it. There are several quality gauges made in this country - Wika, US Gauge, Marshall, to name a few. Most gauges are imported from China. Some are quality, many are not. Unless you are in the gauge business (I was for a while) there is little to judge by. The best insurance is to remove it on pool closure and put a pipe plug in the opening.
    16X32 AB, Pentair SD filter, 3/4hp Pentair Optiflo, CircuPool RJ30+ swg, TF 100

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    appstategrad's Avatar
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    Re: Pressure Gauge questions

    Quote Originally Posted by Isaac-1 View Post
    One thing to check before replacing the gauge is to unscrew it and see if there is a visible clog blocking the inlet.
    Thank you for responding. I had read that on another website and tried before I posted, hoping that would solve my issue.


    ~ 18.5' x 36.5' inground Grecian pool with vinyl liner
    ~ approximately 23,000 gallons
    ~ AquaRite Salt Water Generator cell size t-9
    ~ 1.5 HP Hayward Pump and Hayward Sand Filter
    ~ TF-100 test kit

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    appstategrad's Avatar
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    Re: Pressure Gauge questions

    Quote Originally Posted by Vickery View Post
    Glycerin filled gauges use the glycerin to reduce the effects of pulsation in the monitored line. It is unlikely that many centrifugal pool pumps will see such pulsation under normal use. The biggest gauge killer is leaving them on over the winter. Once the bourdon tube is full of water (the glycerin only fills the case and surrounds the gauge works) there is nothing to displace it and allow the water to drain out. Air that might have originally been in the gauge at installation will be absorbed into the water and be replaced with the water. Ice then breaks it. There are several quality gauges made in this country - Wika, US Gauge, Marshall, to name a few. Most gauges are imported from China. Some are quality, many are not. Unless you are in the gauge business (I was for a while) there is little to judge by. The best insurance is to remove it on pool closure and put a pipe plug in the opening.
    Interesting info, thank you for responding. I do remove mine in the winter. I will order a new one tomorrow. Thanks!

    ~ 18.5' x 36.5' inground Grecian pool with vinyl liner
    ~ approximately 23,000 gallons
    ~ AquaRite Salt Water Generator cell size t-9
    ~ 1.5 HP Hayward Pump and Hayward Sand Filter
    ~ TF-100 test kit

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    Isaac-1's Avatar
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    Re: Pressure Gauge questions

    Quote Originally Posted by Vickery View Post
    Glycerin filled gauges use the glycerin to reduce the effects of pulsation in the monitored line. It is unlikely that many centrifugal pool pumps will see such pulsation under normal use. The biggest gauge killer is leaving them on over the winter. Once the bourdon tube is full of water (the glycerin only fills the case and surrounds the gauge works) there is nothing to displace it and allow the water to drain out. Air that might have originally been in the gauge at installation will be absorbed into the water and be replaced with the water. Ice then breaks it. .... The best insurance is to remove it on pool closure and put a pipe plug in the opening.
    I would think that a Glycerin filled gauge would help as a thermal mass around the bourdon tube in climates like mine where temperatures rarely drop below freezing for over 12-18 hours at a time.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

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    Re: Pressure Gauge questions

    Quite possible. Or your location, both geographically and specifically the filter location may shelter it. There are many dynamics at play. When considering that ice can generate tens of thousands of pounds of force depending upon the amount and temperature, gauges will usually lose. If the tube itself doesn't break and leak, the curl of the tube can be straightened, kinked, or stuck. So even if it moves the accuracy is likely to be affected. Fortunately most pool applications are not critical, noting whether the filter is clogged or clogging being the usual information desired.
    16X32 AB, Pentair SD filter, 3/4hp Pentair Optiflo, CircuPool RJ30+ swg, TF 100

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