In-ground with Cartridge Filter


Algae in the Water
Image by Sportech via Flickr

I cant get my pool clean. Its 20k in-ground with cartridge filter.? I’ve tried about everything. We spoke with a friend who worked for a pool company and he stated that dumping in some earth into the filter may help, but no help at all. We’ve tried vacuuming it but when the water is pushed back into the pool, the algae is still in the water. Its as though the filter isn’t catching it. The cartridge is clean, free of gunk. Our filter is Mythical large cartridge. Shy of contacting a professional cleaning service, I don’t know what else to do and help?
We had the water tested and he told us that all of our levels were within the needed range, therefore we didn’t need to add any chemicals to the water which was odd b/c our pool is full of algae. We dumped a full container of algaecide in the pool and scrubbed the walls. But after 48 hours of the filter running the pool is still filthy – its as though the filter is not trapping the algae and is pushing it right back into the pool. Is changing from a cartridge filter to a DE filter hard/expensive?

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3 Responses to “In-ground with Cartridge Filter”

  • lookingbears:

    The filter doesn’t stop algae. You should do a couple of things.
    1 is to shock the pool. They have granules or liquid at the pool store or home depot.
    Then you should put enough chlorine in the pool to continue to keep the algae and other things in check. Once cleaned use some chlorine tablets in your basket that catches debris. After all is done and the pool is clear you can use some clear all to keep the pool sparkling clean.
    Hope this helps.
    Doug

  • William B:

    buy some algae killer,
    then use clarify-er

  • Big Bully:

    Dumping in earth? What he should have did is tested your water, he could have told you from the test what you need to do.
    My suggest is make sure that your chlorine and Ph levels are in a normal range. If your Ph is to high it is not working with the chlorine to help kill the algae.

    I myself, found I wasn’t getting a accurate readings from the drop kits, it could have been just me or my eyes, because all my Ph level readings were always in the normal, well it turned out I needed more acid. I switch to the strips and I started getting a more accurate reading.

    If this was my pool, I would add a bag of shock, run the pool pump and then test the water. The shock more than likely would have raised the ph level. If the PH is too high, l would add a few cups of acid, then test again later, keep doing this till the ph level is in the normal range. I would also brush the wall of the pool to give the chemicals a hand, then run the pump for about 24 hours during this time.

    Additional info***
    Your pool filter is not a strainer for algae. The growth is in your water and the side of the pool. Have your pool store test your pools phosphate level. Phosphate is the stuff that algae feeds on, if is too high they may recomend a chemical called phosfree.
    I would still do the shock treatment and acid before, this will kill the algae for a minute before it grows back

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