Debris coming back into pool

[Fiveattripp]

I have had a problem for several years. The port on the pool wall where the Polaris plugs in shoots debris back into the pool. I have given up and just kept the Polaris plugged all the time. When it is unplugged you can see small partials coming back into the pool. There is no sand in it so I don't think it is a lateral. I have had an ongoing problem with air in the pump basket too. Wondering if the two are connected. I don't see anything coming out of the other jets in the pool though...only the Polaris port. I have to clean the screen inside the Polaris at least every day and sometimes more. I thought I would try to address it early this season....any thoughts greatly appreciated.

Our equipment is 15 now. I have replaced the multi port and some of the o rings and some of the piping and sand over time.

[Fiveattripp]

Well, after reading quite a bit on the forum I am starting by changing the sand in the filter...I know it was time. Not too difficult...checked and cleaned all of the laterals...thankfull all in good shape...replaced the sand with 350# of new pool sand. I will see tomorrow, after running the pump over night with new sand, what the water looks like and if the debris is still coming into the pool.

[SunnyOptimism]

Can you isolate the pressure side cleaner line from the rest of the pool returns? Does the Polaris operate on its own booster pump? Just trying to get an idea of the plumbing setup.

[Fiveattripp]

The Polaris does have a booster, but I'm not sure how I would isolate that return. I do believe that it is getting better with the new sand, though I don't know why that would make a difference in that one return. I have attached a picture of the pump set up (oops my profile won't let me post an image). I'm just not sure where to check. There are two flexible hoses on that booster pump. They have never been replaced. Is it possible that there is a pin hole in one of them causing some air? The pump basket has air sometimes and sometimes it doesn't. Let me know if there is a way to post a JPG photo so you can see how it is plumbed. Thanks for any thoughts.

[SunnyOptimism]

Hi @Fiveattripp

Attaching Pictures

For attaching images, try using a photo sharing service like Picasa or PhotoBucket. I use Photobucket and whenever I upload a photo, it generates an embedded image link that I can use on most message board systems. I believe Picasa by Google is the same.

So you have two issues - debris in the Polaris return AND bubbles in the pump basket. Let's deal with them separately as I'd be surprised if they were connected.

Bubbles

OK, so bubbles in the pump basket are almost always the result of a leaky or poorly fitted cover seal. On my brand new pump I was surprised to see that the sealing surface for the o-ring on the pump housing was so rough. I got bubbles too but what I did was use some very fine grit sand paper to smooth out the sealing surface (very gentle, you're not trying to take off major amounts of material) and then I also applied o-ring lube (I prefer pure silicone based, not teflon). This immediately made the bubbles go away. So my first suggestion is to take the o-ring off the pump basket cover and inspect both the o-ring for obvious damage and the pump basket sealing surfaces. O-rings, even those that are well taken care of, rarely last more than a few seasons before they develop micro-cracking in the rubber.

It is also possible that the o-ring was replaced some time ago but with the wrong size ring diameter. This too could lead to a poor seal. I actually up-sized the diameter of the o-ring on my pump basket cover (same ID, slightly larger OD so that the thickness of the ring was greater. It made an overall tighter fitting seal.

If the bubbles keep coming back, then you need to look further downstream from the pump suction line and test PVC joints to see if they have developed any leaks (unlikely but possible). The way to do that is to try to submerge or flood the joint with water to see if that stops the bubbles. It's not easy to do and typically requires two people and some creativity on how to best flood the joint with water.

Debris

Honestly speaking, I think replacing the sand was a bit overkill and probably a slight waste of money. I don't own a sand filter but I do know this - sand is sand and, despite what the pool repair guys will tell you, silicon dioxide can't "go bad". Now a sand filter can get very dirty but the filter media itself, the sand, will never go bad. If your sand filter hadn't been cleaned in years, then I would have suggested a deep-cleaning process first before trashing the old media.

Two of the biggest reasons for sand and debris getting through the filter are deep-channeling of the sand media AND/OR broken or damaged laterals. Less likely, but still in the realm of possibility, would be a bad spider gasket on a multiport valve or a bad seal on a push-pull valve (depends on how your sand filter was installed) but that would present other problems (like water leaking out the backwash line, etc).

It is possible in old media that hasn't been backwashed regularly for deep channels to develop in the sand such that water and debris flows through the media without much filtration. Think of it like a dry and cracked muddy lake bed. Water can easily flow through the channels. However, if you did have deep channeling, I would expect to see debris coming out of all returns unless the booster pump is sufficiently strong enough that it would draw most of the water through that one return and collect debris in that line (possibly at a vertical 90deg elbow buried somewhere).

As you posted, your laterals were fine upon visual inspection and replacing the sand media would have corrected any channeling problem. So you'll have to update us in the long term on if your debris problem is gone.

The only other sources of debris would be from a cracked PVC line somewhere but that is really a remote possibility. Unless the plumber did a lousy installation job, buried PVC piping is pretty resilient. The only time I ever saw a buried PVC break was from tree roots. It was a buried 1-1/2" diameter PVC line for an irrigation system and a nearby tree had sent out some roots looking for water. The roots were literally wrapped around the pipe and cracked it. It was impressive.

Anyway, keep this post/thread going with pictures and updates as I'm interested in how this all resolves.

Cheers

[Fiveattripp]

https://www.dropbox.com/s/u0v04cj1ae...pump1.JPG?dl=0

Thanks so much for the help. I have attached the link to the pump and booster pump. Our Sand was in bad shape...even though I try to keep it back washed and stay on top of the care of the pool. I guess it might have been about 8 years since I changed it. The pool is 15 this season and I changed it once. The water is looking good now. I will do what you said with the basket lid where the O ring sits. It is a new O ring so I don't think it is shot. I inspected the spider gasket last week thinking it might be that. It is in good shape too. Trial and error..I will keep you posted...again Thank you for sharing your knowledge!