Multiport problem

[True Blue]

I'm not the multivalve expert but there are 3 things that come to mind:
1) The Gasket (Called a Spider Gasket because it looks like a web) was installed incorrectly and still is.
2) The spring(s) for the multivalve are either damaged or installed incorrectly.
3) One of the chamber walls in the Multivalve is damaged, cracked or holed, and the water's getting through there into the backwash port.

There could be other issues, but, again, I'm not the multivalve expert.

Carl

I'm on my second gasket. The first one worked for about 2 months last season and about four hours this season.

I inspected the inside of the multiport very thoroughly and I didn't see any problems.

[PoolDoc]

There's an relatively easy fix, that can work for a long time: just attach a 1.5" or 2" ball valve to the discharge port. Keep it closed when you are not backwashing; open it when you are.

I can't tell you how to attach it without seeing a photo of your multiport, but if you mail a couple to poolforum AT gmail DOT com, I'll post them.

Obviously, this won't fix your multiport, so it would be best of you installed a threaded valve that you can save and resuse later. But, it's a way to get a quick functional fix for now.

Ben

[True Blue]

I can't tell you how to attach it without seeing a photo of your multiport, but if you mail a couple to poolforum AT gmail DOT com, I'll post them.

Ben

Photos have been sent.

[True Blue]

I went out to check on things and decided to backwash. As I feared, afterwards the leak during filtration was back.

[PoolDoc]

Based on the pics below, it appears you can use a 1.5" x 6" PVC nipple and a 1.5" FIPxFIP PVC ball valve to solve your problem temporarily. Both of those items are available at my local Lowes . . . but I don't know about yours.

Ben

[CarlD]

Yes, I can get those things easily here in New Jersey, maybe even easier than Ben can in Georgia.
It's a Hayward multivalve and those things are pretty much the same.

Carl

[True Blue]

I've determined that it isn't filtering properly. My pressure guage was broken, so I couldn't quite tell, but I suspected a problem. I read in another thread on here how to test for proper filtration using DE. I did that and my suspicions were verified. My question is, do I need to replace only the multiport? I assume that the filter does nothing more than hold the sand.