Is this Check valve necessary?

Pool pumps, pool filters and the plumbing of
swimming pools. Sand filters, cartridge filters,
fabric filters and alternative filter media.
joey900rr
Pool Newbie
Pool Newbie
Posts: 2
Joined: Thu 20 Apr, 2017 19:45
My Pool: 16x32 Plaster inground pool with Hayward C4025 filter and 2.0 HP pump. Roof mounted solar heat.

Is this Check valve necessary?

Postby joey900rr » Thu 20 Apr, 2017 20:09

Hi guys I have a question about check valves. I have to re plumb my filter because both my check valves went bad. The one that goes to the solar heat pipe is already replaced and I understand why its necessary but I have another one right where the pressurized water comes out of the filter and am wondering if that one is necessary also. I can't think of a reason it needs to be there and all the plumbing videos I see don't have one there. here's a pic . Thanks for any help.


joey900rr
Pool Newbie
Pool Newbie
Posts: 2
Joined: Thu 20 Apr, 2017 19:45
My Pool: 16x32 Plaster inground pool with Hayward C4025 filter and 2.0 HP pump. Roof mounted solar heat.

Re: Is this Check valve necessary?

Postby joey900rr » Thu 20 Apr, 2017 20:11

I can't get the pic to upload . Not sure why. Sorry guys.
Denniswiseman
Swimming Pool Superstar
Swimming Pool Superstar
Posts: 567
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: Is this Check valve necessary?

Postby Denniswiseman » Sat 22 Apr, 2017 05:47

Generally NRV are used to prevent any water going back
Sometimes they may be used if a SWCG is installed after the filter to prevent freshly chlorinated water going back to the filter or on the pump suction side to help with priming
Most pipes after the filter go straight to the pool returns
If you don't have any equipment after the filter give it a try without the NRV

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