Leaking Hayward Sand Filter - Pump Running with MPV “Closed”

capricatunes

Bronze Supporter
Jun 3, 2020
22
Minneapolis
I noticed a slow drip coming from a (union?) valve of my filter (I believe it’s the return port). Please see the red circled area in the pic. I’m also attaching a pic of the Filter - I believe it’s a Hayward s200.

Should I attempt to tighten this nut? Just leave it alone? Replace it? It slowly builds to a drip, so it seems rather tame at the moment.

I’m not sure if this is related, but a family member ran the pump for almost an hour with the MPV in “closed” position. It was just after realizing this that I now see a drip coming from the filter, but it could have been happening before. Perhaps they’re unrelated?

Thank you for any help!
 

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YippeeSkippy

Mod Squad
LifeTime Supporter
Jan 17, 2012
13,817
Evans, Georgia
Ohhhh I'd say that pump building up pressure against a closed multiport valve probably encouraged this problem for sure! Do the simple stuff first...check your union, re-tighten it, etc. Check your gaskets and use pool lube where necessary.
 
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capricatunes

Bronze Supporter
Jun 3, 2020
22
Minneapolis
Ohhhh I'd say that pump building up pressure against a closed multiport valve probably encouraged this problem for sure! Do the simple stuff first...check your union, re-tighten it, etc. Check your gaskets and use pool lube where necessary.
I’m concerned with adjusting and tightening because these parts are so old. I’m worried I will make it worse... is it harmful to have a slow leak like this? It appears to be filtering well still. I don’t want to keep adding water, but I also don’t want to crack a valve that’s already aged. Know what I mean?
 

sktn77a

Gold Supporter
May 16, 2010
1,755
Chapel Hill, NC
The leak has no consequence other than to your sensibilities. ;) You can check that the o-ring is seated correctly and that it has silicone/teflon lube/sealer on it (NOT caulk). Then, strong hand tight should be all it needs.
 
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