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Thread: My d/e filter needs frequent backwashing

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    My d/e filter needs frequent backwashing

    Good day all.
    Im new to this site but from what I have read you guys know what your are talking about.
    I just opend my pool last week. It had a desent amount of algae in it. My d/e filter was doing a good job of clearing it all out except it constantly needs to be backwashd. The pressure seems fi e but the water just sits there until we backash it and it starts running beautifully again. It seems lime the period from when it's running fine to when it just does nothing is about 4 to 6 hours. I tried cleaning out the filter again ( I clean it at the end of every season) and I put d/e in the pool after the backwashing, but after 4 hours itsthe same situation. I don't k ow what to do? Any suggestions?

    My pool is 30k gallons with a 2 year old d/e filter after each backash I replace the d/e at a rate of 4.5 to 6lbs via a d/e scoop. This is the first time I have experienced this problem.

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    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana

    Re: My d/e filter needs frequent backwashing

    Welcome to TFP.

    Frequent backwashing can be needed on a DE filter when dealing with algae. Just a downside of efficient filtration. Best advice I can give you is to stay after it, maintain high enough chlorine level to get rid of the algae as quickly as possible, and to run the filter on recirculate when you aren't available to backwash it frequently.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: My d/e filter needs frequent backwashing

    Thank you for your reply. We did have algae when the pool was first opened but it's all deal and resting at the bottom of the pool. We were waiting till the pool was clear enough to see and vacuum the remaining algae out of the pool. I will take your advice and continue to backash and put it on recirculate when we are unavailable.
    One more question? is this a common problem cause I have never had this problem in the past?

  4. Back To Top    #4

    Re: My d/e filter needs frequent backwashing

    Your filter is working as intended. All that dead algea is being caught in the filter and will need to be removed via backwashing when your pressure increases . This will require less backwashing as the process goes forward.I would recommend changing your pressure guage.They can and do go bad.

    Continue to brush your pool that will help it get to the filter and also expose algea thats hiding under the dead stuff. You should continue to see the backwashing requirement decrease , and eventually return to normal.
    20k gal. IG fiberglass/plaster rectangle 32'x16'
    Hayward Superpump 3/4 H.P. primary Hayward model 5060 Booster Pump
    Hayward Pro Series High Rate Sand Filter
    Pentair Model 320 automatic Chlorine/bromine in-line feeder

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