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Thread: New filter...

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    Join Date
    Apr 2010
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    Sunny Phoenix AZ
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    74

    New filter...

    So this weekend I took the plunge and opened up my DE filter for the first time since we bought the house, and I'm guessing it was the first time it had EVER been opened. I intended to clean the internals, which I did, but then decided before reassembly that it was pointless since all of the leaves were missing about 25%of their mesh...
    I wanted to switch to a sand filter anyways because I hate dealing with DE.
    Anyways, 48 hrs later I'm the proud new owner of a Hayward 30" sand filter that I installed myself and aside from some cosmetically challenged piping, it seems to run great.
    The pool has been sitting idle for a few days and it was really windy today. You couldn't see the drain at the bottom in broad daylight (8' deep).
    I turned the pump on and it started up around 18 psi but over about 30 mins it rises to 30+ psi. I backwash and it drops back down to 18. I've done this several times tonite and it seems pretty predictable and I assume this is going to be the norm until the water clears up... But I wanted to check and make sure I didn't screw something up that is causing the pressure to rise quicky...
    Thoughts, feelings, encouragements?
    28,000 gallons / Plaster / Hayward 30" Sand Filter / PoolCleaner 4x / PoolSkim / Hayward RS1500 / CircuPool RJ60

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    Join Date
    Feb 2012
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    Central Indiana
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    42

    Re: New filter...

    Its a possibility that DE was leaking into the pool and the sand filter is pulling it out, that would make sense i believe. Not had that experience personally but have read a couple threads on here to that effect.

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    Re: New filter...

    dombey,

    Your sand filter is doing exactly what it is supposed to do.....filtering out junk from your pool, even though you may not be able to see it.

    In your climate, I suspect you have a nice algae bloom starting up (yes, it can be invisible for a while) and that you may need to shock your pool. A complete set of test results would give us some more clues.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: New filter...

    Quote Originally Posted by duraleigh
    dombey,

    Your sand filter is doing exactly what it is supposed to do.....filtering out junk from your pool, even though you may not be able to see it.

    In your climate, I suspect you have a nice algae bloom starting up (yes, it can be invisible for a while) and that you may need to shock your pool. A complete set of test results would give us some more clues.
    I think I'm clear on algae. Zero measurable FC loss yesterday (water is cold and overcast). That was with my FAS DPD kit at .5 granularity.
    Where I do have issues is on TA (180 initially, now 160)... But I'm all over the acid/aeration cycle.
    28,000 gallons / Plaster / Hayward 30" Sand Filter / PoolCleaner 4x / PoolSkim / Hayward RS1500 / CircuPool RJ60

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    Melt In The Sun's Avatar
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    Oct 2009
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    Tucson, AZ
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    Re: New filter...

    If your pool is cloudy, there's about a 99% chance you have algae. I'd check again!
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    Re: New filter...

    If it's not algae, your filter certainly appears to be clogging up with something. You'll simply have to keep backwashing each time the pressure rises until you can run the pump and the pressure holds steady. It should be longer and longer between backwashes as the water gets cleaner.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  7. Back To Top    #7

    Join Date
    Apr 2010
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    74

    Re: New filter...

    So, I'm pretty sure it was a large amount of DE that got into the pool during the filter disassembly and swap. I had a bad backwash valve as well; it always pumped brown water into the pool...
    The pool is definitely clearing up and the backwashes are much less frequent although overnight it is still building to 30 psi. It runs at 18 on a clean filter.
    I'm out of town until Tuesday but I'll shock it when I return to make sure I'm clear.
    28,000 gallons / Plaster / Hayward 30" Sand Filter / PoolCleaner 4x / PoolSkim / Hayward RS1500 / CircuPool RJ60

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