Filter pressure fluctuates

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Bountyhunter5300
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Joined: Tue 26 May, 2020 19:29
My Pool: 15x30 in ground, hayward filter and pump, vinyl liner

Filter pressure fluctuates

Postby Bountyhunter5300 » Tue 26 May, 2020 21:22

Just opened the pool for the year and when i turn the pump on it primes good and reads about 10-12 psi on the filter gauge; it will continue running like that for between 1 and 5 minutes then all of a sudden the sound will change and it will drop to 8 psi for a few seconds then back to 10, then drop to 6psi and back to 10, then drop to 4 psi and back to 10 and will run at around 10 for a minute or so and repeat. You can also see air bubbles around the return jet. I checked the surface plumbing for any air leaks on the suction side with soap and water and also and water drips on the pressure side and there is nothing visible. I can't figure out what to check next or how to solve this. This is an inground pool with a hayward pump and hayward de filter, the pump is a year old, the filter about 5 years. Any ideas?


Denniswiseman
Pool Industry Leader
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Posts: 2410
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Filter pressure fluctuates

Postby Denniswiseman » Wed 27 May, 2020 01:36

It seems that you have a suction side air leak
The only thought for the pressure fluctuation is that the higher pressure causes the suction leak and pressure drops off. When it drops off the suction side leak stops, it fills up and normal pressure for a while
Check the pump basket "O" ring and lubricate with silicon grease
Bountyhunter5300
I'm new here
I'm new here
Posts: 3
Joined: Tue 26 May, 2020 19:29
My Pool: 15x30 in ground, hayward filter and pump, vinyl liner

Re: Filter pressure fluctuates

Postby Bountyhunter5300 » Wed 27 May, 2020 20:01

Thank you for the response and that is a good thought, i used silicon grease around the pump basket, but sadly that didnt fix the problem. Even when i remove the pump lid you can tell it was under pressure because as i loosen it you can hear the suction release. I also tried cleaning the fingers and the filter itself. Still same is happening. I just don't know.
Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 2410
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Filter pressure fluctuates

Postby Denniswiseman » Thu 28 May, 2020 07:53

Can you run the pump at a slower speed
Bountyhunter5300
I'm new here
I'm new here
Posts: 3
Joined: Tue 26 May, 2020 19:29
My Pool: 15x30 in ground, hayward filter and pump, vinyl liner

Re: Filter pressure fluctuates

Postby Bountyhunter5300 » Thu 28 May, 2020 10:38

I cant, its a single speed pump.
Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 2410
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Filter pressure fluctuates

Postby Denniswiseman » Thu 28 May, 2020 10:48

Check if the pump basket fills with air, clears and then refills with air
What happens if you put the MPV to recirculate
Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 2410
Joined: Tue 06 Sep, 2011 05:48
My Pool: 10k inground fibreglass, Telescopic Cover, Hayward Powerline pump, Quality filter with glass media, 27kw output heat pump, K-2006C test kit
Location: United Kingdom

Re: Filter pressure fluctuates

Postby Denniswiseman » Thu 28 May, 2020 10:49

Also check the water level at the skimmer and that the skimmer door isn't jammed up
bigredwv
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Joined: Mon 12 Apr, 2021 15:35
My Pool: 25x40, hayward s-240, chlorine, liner

Re: Filter pressure fluctuates

Postby bigredwv » Mon 12 Apr, 2021 15:36

Having this issue now. Were you able to resolve it?

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