Sand filter question

[NewPoolGirlTX]

Newbie question
In this picture, in the yellow area where the pipe meets the black part of the assembly, if that is not sealed, what stops sand from getting in there and eventually into the pool? Is it the pressure?

 

[1poolman1]

Unless it is broken, the center pipe (standpipe) usually is glued into the manifold. I have never seen an instance where the pipe and manifold are separate. If that is not sealed, then yes, sand can enter the pool, but the fit should be tight enough to prevent that if it was designed that way. I've installed at least 100 S-244T filters. I examine every lateral assembly, as I do with all brands that have this type of internal plumbing, before filling to be sure there are no problems and the standpipe and manifold have always been, essentially, one piece.

 

[NewPoolGirlTX]

Unless it is broken, the center pipe (standpipe) usually is glued into the manifold. I have never seen an instance where the pipe and manifold are separate. If that is not sealed, then yes, sand can enter the pool, but the fit should be tight enough to prevent that if it was designed that way. I've installed at least 100 S-244T filters. I examine every lateral assembly, as I do with all brands that have this type of internal plumbing, before filling to be sure there are no problems and the standpipe and manifold have always been, essentially, one piece

It is glued but I can see a gap between the center pipe and the manifold. It almost seems like there should be a bead of caulk or something where they meet.
Not sure if you can see it in the photo below. My old one has a gap as well but it looks like there was glue or something there and it separated which is why I wondered.

Thanks so much, I appreciate the help.

 

[Texas Splash]

Yes, it's visible. Without measuring, it's hard to tell if it's any wider than the gaps already in a lateral. Still a good catch. While there are a variety of epoxy's and sealants on the market that might work for this application, let's see what @1poolman1 would recommend in case there might ever be the possibility of removing the lower (black) manifold/hub assembly from the center pipe in the future. Usually not, but just in case.

 

[NewPoolGirlTX]

So this is my old one. You can see sand in it but also I can see a gap that I can't see sand so don't know if it goes all the way down. I may be just too nit picky. I can't see any cracks in my laterals. But my Polaris picks up sand in the sand and silt bag. It's a small amount but it was every day. That's why I'm replacing it. And I just don't want the same problem after going thru all this work. I might be a tad type A. but it may not matter enough to worry about

 

[Texas Splash]

I might be a tad type A.

Welcome to the TFP club. We're all that way now.

 

[1poolman1]

So this is my old one. You can see sand in it but also I can see a gap that I can't see sand so don't know if it goes all the way down. I may be just too nit picky. I can't see any cracks in my laterals. But my Polaris picks up sand in the sand and silt bag. It's a small amount but it was every day. That's why I'm replacing it. And I just don't want the same problem after going thru all this work. I might be a tad type A. but it may not matter enough to worry about

I have never seen the standpipe come out of the manifold. They are assembled at the factory. The pipe is machine cut and extends completely into the manifold to the built-in stop. You could take the dauber that comes with PVC glue and run a bead of glue into the gap. The best would be a "blue" glue as available at Home Depot. They have more PVC solids in them. Allow the glue to fill the gap and then let it dry completely before installing the assembly back into the tank. Just enough to fill the gap. I don't believe sand is getting to the pool through that gap, but if it gives you piece of mind . . . Practice on the old one first.

 

[NewPoolGirlTX]

Thank you so much
I appreciate the help and advice