Multiport problem

[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.

[CarlD]

I can think of 3 reasons you're getting blowback on the DE test.
First, the obvious: It's your multivalve.
Second, you may not have sufficient sand and it's passing through
Third, It's also possible your laterals are cracked or broken...but that explains the DE, not the leaking.

You could fix or replace just the multivalve. If the problem goes away your are done. If not, you'll need to empty the sand and inspect/replace the laterals, and refill with new sand.
It should STILL be cheaper than replacing the filter.

Of course, you could replace the whole thing with a bigger filter. I'm wondering if the pump is too big for it....what model and brand pump is it?

Carl

Carl