Air in Pump when Backwashing Sand Filter

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curtis1031
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My Pool: in-ground pool above filter system

Air in Pump when Backwashing Sand Filter

Postby curtis1031 » Mon 28 Oct, 2019 22:29

Hi friends,
I am fresh to the pool system. When I do normal filtering mode, it works fine (small air bubbles underneath pump lid and remain same size). I assume there is no leakage from entry side (o-ring and water inlet pipe). However, I found a headache on getting air in pump when I do backwashing my sand filter. Just wondering why the problem comes from and how to check/fix?
Thanks for every answer.


Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 1338
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: Air in Pump when Backwashing Sand Filter

Postby Denniswiseman » Tue 29 Oct, 2019 06:54

What happens when you vacuum, because if you have a suction side air leak it shows up more when vacuuming
curtis1031
I'm new here
I'm new here
Posts: 3
Joined: Mon 28 Oct, 2019 21:20
My Pool: in-ground pool above filter system

Re: Air in Pump when Backwashing Sand Filter

Postby curtis1031 » Tue 29 Oct, 2019 07:10

Thanks. I haven't yet tried vacuuming. Can I ask what's the reason? Mine is an in ground pool and water surface is above the pump and possibly above filter. When it's operating the water level is half way above the skimmer entry.
Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 1338
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: Air in Pump when Backwashing Sand Filter

Postby Denniswiseman » Tue 29 Oct, 2019 15:47

curtis1031 wrote:Thanks. I haven't yet tried vacuuming. Can I ask what's the reason? Mine is an in ground pool and water surface is above the pump and possibly above filter. When it's operating the water level is half way above the skimmer entry.

The idea is to find out if you have a suction side air leak
Irrespective on where your equipment is situated you can still suck in air (probably around the pump)
I had a suction side air leak that was on a pump seal when vacuuming
curtis1031
I'm new here
I'm new here
Posts: 3
Joined: Mon 28 Oct, 2019 21:20
My Pool: in-ground pool above filter system

Re: Air in Pump when Backwashing Sand Filter

Postby curtis1031 » Wed 30 Oct, 2019 04:39

Does it mean a air leakage from pump suction side? But how to explain when doing filter (which still suck water from pump) there is no air bubble? Thanks
Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 1338
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: Air in Pump when Backwashing Sand Filter

Postby Denniswiseman » Wed 30 Oct, 2019 09:59

It all depends on the extra load being put on the pump
All pools are different, just try vacuuming and see if there is any difference

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