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Thread: Pressure Gauge needle bouncing around a little bit, but more with new gauges.

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    Catanzaro's Avatar
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    Pressure Gauge needle bouncing around a little bit, but more with new gauges.

    I replaced the pressure gauge, not once, but twice with no success. I even had a spare gauge and the new ones are all functioning the same. The needles are bouncing all over the place. I used Teflon tape and did not over tighten. There is no water dripping from the Multi-Port.

    Is there air in the system? How do I know? The returns are fine. Could it be the rotating heads create some sort of air movement in the system. Pressure is at 14 psi. I put the old Hayward gauge as that one did not bounce around anywhere near as much as the new ones.

    Please help!
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
    Hayward Pro-Series 350 LB. Sand Filter Model # S270T - 2" Plumping
    Hayward CL2002 Chlorinator - Hayward Super Pump 2 HP Model # k48m2n111
    Hayward AQR9 SWG 25K Salt Cell & TF-100 Test Kit + Speed Stir
    Gulfstream HE125RA - 117K BTU Heat Pump - Date of Build is 11-2013

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    Mod Squad jblizzle's Avatar
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    Re: Pressure Gauge needle bouncing around a little bit, but more with new gauges.

    I recall my pressure moving around some when the floor system rotated between zones. But it was steady when it was not switching.
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    Re: Pressure Gauge needle bouncing around a little bit, but more with new gauges.

    If you have an I ground floor system then your gauge will change as it rotates thru the different stations. Different sized nozzles, different amount of heads, and pipe runs will account for this. Sometimes vibration from the pump or the filter not sitting flat on its base can cause the needle to vibrate.

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    Re: Pressure Gauge needle bouncing around a little bit, but more with new gauges.

    Quote Originally Posted by OldPoolMan View Post
    If you have an I ground floor system then your gauge will change as it rotates thru the different stations. Different sized nozzles, different amount of heads, and pipe runs will account for this. Sometimes vibration from the pump or the filter not sitting flat on its base can cause the needle to vibrate.


    The pump does cause some vibration. I do not have a floor system, but 4 rotating oscillating 360 degree return heads. It appears that there is no air in the system returns or filter pump basket. I can live with the needle bouncing slightly as long as air is not in system. The threads are not stripped either as I am careful in removing and installing gauge.

    Vibration on plumbing

    I checked this evening the vibration of the plumbing and the filter-pump basket, etc. It appears that this could be the cause of the needle moving back and forth at the 14 psi mark. The other gauges are probably of low quality, while this is the original Hayward (and probably of better quality). I know when I walk on the concrete, the pool water (with filter off) moves. You would think that all that weight of the concrete and a person walking would not effect the water. So I am assuming that the vibration of the filtration system definitely can make the needle move and not stay at a steady 14 psi. The pressure of water through the sand is probably fluctuating slightly.
    Last edited by Catanzaro; 07-18-2015 at 07:45 PM. Reason: Vibration on plumbing
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
    Hayward Pro-Series 350 LB. Sand Filter Model # S270T - 2" Plumping
    Hayward CL2002 Chlorinator - Hayward Super Pump 2 HP Model # k48m2n111
    Hayward AQR9 SWG 25K Salt Cell & TF-100 Test Kit + Speed Stir
    Gulfstream HE125RA - 117K BTU Heat Pump - Date of Build is 11-2013

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