Air getting into system

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GlenP
I'm new here
I'm new here
Posts: 3
Joined: Fri 24 Mar, 2017 05:15
My Pool: Above ground 43.5m3, Pentair pump 1.5hp 22m3 per hour, Lacron 36" max flow 31m3 per hour with Zebrite filter medium 250kg.

Air getting into system

Postby GlenP » Fri 31 Mar, 2017 02:40

My first post to this site, at the end of last season my pump was drawing in air to the extent that the heat pump was under performing, and the filter a large 36" Lacron (above the level of the pool) was filled with so much air that when the pump was turned off the air would blow back to the pool leaving the pump strainer empty of water it would even pop out the skimmer basket. After pouring through posts here I realised I had a leak on the vac side, so have overhauled a lot of the fitting in front of the pump (thanks for the all the tips I would never had thought about the strainer drain plug) and think I've fixed the air leaks. The pump stainer now only has a few air bubbles (the size of 6 to 10 peas) trapped under the lid, I can see the water level in the filter is near the clear (opaque in my case) lid maybe 3" or 4" down after several days running, and when the pump is off its strainer sits full of water. So hugely better, heat pump is working really well now too.

However when the pump is off there is a glugging noise in the Multi Port valve like its drawing in air? and although difficult to see I think the water level in the filter is dropping away. Should I be looking to service this valve, the backwash/waste is open to air should I put a valve on it? I have never opened up this valve before. Any ideas please?


Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 2591
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 getting into system

Postby Denniswiseman » Fri 31 Mar, 2017 16:49

Does water come out of the backwash if not then you don't need to valve it
Your suction side seems OK by your description
It would probably be a good idea to replace the spider gasket in the MPV as this is where problems could occur
GlenP
I'm new here
I'm new here
Posts: 3
Joined: Fri 24 Mar, 2017 05:15
My Pool: Above ground 43.5m3, Pentair pump 1.5hp 22m3 per hour, Lacron 36" max flow 31m3 per hour with Zebrite filter medium 250kg.

Re: Air getting into system

Postby GlenP » Sat 01 Apr, 2017 12:05

Thanks for the response, no water is not coming out of the backwash. Its just when the pump is off lots of glugging noise around the MPV and hissing sound of air? I'll replace the spider gasket (when I can identify the valve and find a supplier in the UK) I think the filter is a Lacron 36" and the valve 3" says SM30- on the face plate at 3 o'clock.

Should the filter be normally full of water?
Denniswiseman
Pool Industry Leader
Pool Industry Leader
Posts: 2591
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 getting into system

Postby Denniswiseman » Sun 02 Apr, 2017 02:49

Did you purchase the filter complete with the MPV here in the UK. If so you could go back to the supplier and identify the part. Otherwise a lot of Googling
My pool and filter came from South Africa and I have to have parts shipped in albiet they are cheaper than purchasing from here if I can find the part
I can't see inside my sand filter but I think there is an air gap

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