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Thread: DE backwashing into pool

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    DE backwashing into pool

    Hello,

    About a month ago when the temps warmed up, we had a big algae bloom. We shocked the pool and that killed the algae but all green sludge needed to be flushed. We backwashed the pool successfully but noticed that there was more green sludge so we decided to run the filter for another full day and then do another backwash before recharging the filter and starting over fresh for the season. As I was waiting for the backwash, I went over to the pool to get a water sample to check the Ph. Then I heard a pop, and the DE and green sludge started filling the pool from the 3 ports at the bottom of the pool (sorry, obviously I don't know the proper terminology for the equipment LOL) . Yikes. It was a big mess and we ran the filter for another day to recapture it all, but now the backwash just flows straight into the pool. We tried closing the little hatch on the bottom of the 2 skimmers and did another backwash, this time I saw lots of dirty water leaving the filter..but it pumped out through the waterfall.

    As a side note, our backwash doesn't come out a separate outtake hose, it is plumbed to go somewhere. I have no idea where...we're on septic and I doubt they'd plumb it to dump DE into the septic tank, we've never seen any water coming out anywhere after backwashes, so we have no idea where it goes - we've had pool guys come out before and they are at a loss as well. There is a little sight glass on the pipe so we can see the water coming out of the filter, so we can see when it is dirty and when it starts to run clean.


    Why is our DE pumping into the pool - does this indicate a clog or a break somewhere? If not, is this something that we can fix ourselves?

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    Re: DE backwashing into pool

    A overall picture of your equipment pad may be helpful.

    With that we can figure out if something is wrong or if something is broken.
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

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    Mod Squad jblizzle's Avatar
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    Re: DE backwashing into pool

    Welcome to TFP!!!

    You should NEVER run the water through a DE filter with no DE in it, which is what it sounds like you did. Guessing that the algae clogged up the grids due to the lack of algae and that maybe the pop you heard was something breaking in the filter. That really should not be possible, but it is the only explanation I can think of that would result in DE and algae all flowing back to the pool.

    What you also need to remember is that a filter will not clear up a green pool. Algae is a chemistry problem not a filter problem.

    {Sorry there was a 2 hour delay between when I started this message and when I could send it}
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: DE backwashing into pool

    Thank you, gwegan. Not sure what would be helpful or not so I just took a bunch of pics of everything. Its really hard to maneuver in there so its hard to get a good angle to take pics. Also keep in mind that we did not design and build this, we inherited it from the previous owner

    jblizzle, I had no idea that it was bad to run the filter with no DE - why not? We took the filter out and inspected everything, nothing appears broken.














  5. Back To Top    #5

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    Re: DE backwashing into pool

    Just a guess, but that kind of looks like a DE separation tank on the right side of the second to last pic. My -VERY LIMITED - understanding is it separates the DE out during a backwash. The backwash water - sans DE then returns to the pool. Maybe the containment bag within that tank which separates out the DE failed??

    Here's a link to one type of DE separation tank:
    Pentair D.E. Separation Tank - Stainless Steel
    Gene
    ​12,300 gal IG play pool - Pebbletec - built 10/1999 || Hayward S360SX 36" sand filter || Hayward Ecostar SP3400 VSP || A&A In-Floor cleaning system || Quik Water Leveler || Quik Dek-clor (limited use)
    TF-100 testkit / Speedstir - A good test kit is not an expense, it's an investment

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    Mod Squad jblizzle's Avatar
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    Re: DE backwashing into pool

    That looks like a pretty good guess there Gene
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: DE backwashing into pool

    Quote Originally Posted by jblizzle View Post
    That looks like a pretty good guess there Gene
    Thanks Jason...... pure luck and a little -ing.
    Gene
    ​12,300 gal IG play pool - Pebbletec - built 10/1999 || Hayward S360SX 36" sand filter || Hayward Ecostar SP3400 VSP || A&A In-Floor cleaning system || Quik Water Leveler || Quik Dek-clor (limited use)
    TF-100 testkit / Speedstir - A good test kit is not an expense, it's an investment

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