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Thread: Sandy debris near return jets

  1. Back To Top    #1

    Join Date
    Jun 2014
    Location
    Plano, Texas
    Posts
    2

    Sandy debris near return jets

    Hi TFP! I'm a new user - first post here We bought our house last year - has a 20K gallon pool, plaster. Pentair DE filter. Other than issues with our Polaris 280 last year, super easy to maintain, had a blast!

    This year, I'm a bit stumped. Our pool has been dirtier than usual. We've done a bit of backyard reno, so I initially chalked it up to that, but now I really don't know and would like the advice of the fine folks here at TFP!

    So we ripped out some bushes In May and leveled a bunch of dirt. We laid down around 100 sq ft of Oklahoma flagstone, and used normal Quikrete mortar to fill in the gaps. Also had a pergola/arbor installed. Pic: https://www.facebook.com/photo.php?f...5&l=271c388c39 - pool is to the bottom right of the picture, you can see the skimmer basket cover

    We had been seeing more debris on the bottom than usual. Looked like a sand color, also around the same consistency. Most of it accumulates around the return jets, so I'm assuming it's coming back from the return jets. I initially thought it was dirt from leveling the ground to lay the rock. Then thought it could have been from the flagstone or the mortar or the pergola. We've had about 10 good rains since then, and it's been about 4 weeks since we've completely finished all work with the rock/mortar. I'd have figured any residual dust would have washed out by now? All edges slope away from the pool, so I have a hard time believing even if it was that debris, it was washing into the pool. I clean out the pool pump filter weekly, and drain the skimmer baskets at least 2-3x weekly.

    I've backwashed the Pentair twice since then. The second backwashing was last Saturday. Each time I backwashed I left the pool pump running about a minute and a half with the BW valve open. Our pool guy told us initially 20-30 seconds, but a few YouTube videos recommended a minute.

    I looked up a few YT videos and completely disassembled the Pentair, including removing the drain plug and taking out each grids/thoroughly washing out the container. There seemed to be more "gunk" on the bottom - maybe DE, maybe what appeared to be the sand junk kind of clogged up at the bottom. I had to remove the drain plug, poke the hole and spray it with water just to get it all out of there. (I had previously disassembled the Pentair back in late April and given it a good thorough cleaning - I don't recall that much DE/sand stuff at the bottom) My initial thought before opening was that the grids probably had a hole in it, but I inspected each one and they still looked pretty new. I did see some debris on the inside of the grid though...tried to wash it out as best as I could.

    Reassembled it last Sat. Pool does look cleaner, but we're still seeing some brown light sand debris near the return jets. Less than it was, but still there. Any advice for a newbie? I'm just completely stumped...I've looked over YT and these forums and haven't had a lot of luck piecing it together, other than cleaning out the DE filter. Am I missing something obvious? And should the de/sand stuff collect at the bottom of the filter even after backwashing it out, or should that all have been swept out? (IE, maybe the backwash pipe is clogged, or I need to backwash it longer?)

    Any suggestions the pros here have I would love to hear. Thank you for the help.


    -Frustrated Guy with a 6 month Pregnant Wife That Wants Him to Fix Our Pool, aka Melvin

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Sandy debris near return jets

    Welcome to TFP!

    You can check if this stuff is coming through the filter by tying a stocking/knee high over the return jet. If stuff accumulates in there then there is something wrong with the filter. If nothing accumulates in the stocking the debris is coming from outside.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Join Date
    Jun 2014
    Location
    Plano, Texas
    Posts
    2

    Re: Sandy debris near return jets

    Quote Originally Posted by JasonLion View Post
    Welcome to TFP!

    You can check if this stuff is coming through the filter by tying a stocking/knee high over the return jet. If stuff accumulates in there then there is something wrong with the filter. If nothing accumulates in the stocking the debris is coming from outside.
    Thanks Jason! I managed to find one of my wife's and just attached it with a rubber band. Will report back tomorrow. My hunch is, it's the filter, but will confirm tomorrow. Given that the grids don't have any holes in it, and the top manifold didn't appear to be cracked, any ideas on what else I should be checking if it is the filter?

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