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Thread: Hello from Wylie! Newb with filter question.

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    lkalred's Avatar
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    Hello from Wylie! Newb with filter question.

    First post on ANY forum. Inherited pool with new house. Algae almost gone. Water clear. Forsaking pool store as have already been subjected to sales pressure.
    Last complete test done at Leslies. TF100 on the way. Currently have basic chlorine/ph test kit left by previous owner.

    FC-6
    ph-7.4
    CH-300
    CYA-50
    TA-80

    Question is this, have noticed that immediately post backflush pressure will drop to 16 psi, but will rise to 30 psi within 24-48 hrs. This has happened multiple times. New filter grids installed in Feb.
    Unable to bleed air from filter manually after cleaning pump basket.
    Will residual air pressure prevent filtration through entire grid causing pressure to rise this quickly?
    If there was a blockage I would not expect pressure to decrease at all. How can I obtain a flow diagram for filter as well as grid cleaning procedure? Have opened filter housing, grid removal not immediately obvious.
    The service rep who replaced the filter grids did not mention any other problems save for the apparently broken air relief valve, or does this particular unit have an automatic air bleed system? thus rendering my theory moot.


    The filter is a Hayward micro-clear DE720S w/ 72 sq/ft grids. 2.5 hp AO Smith pump. 24k gal. IG. plaster. chlorine. pool built 1995. fountain. tree over deep end.


    Thanks,


    Keith
    250Gal, portable spa, K-2006

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    Re: Hello from Wylie! Newb with filter question.

    Algae almost gone
    That may be the answer to your pressure rise. Since the psi drops to normal after you clean, the filter seems to still be catching stuff and slowly the psi increases as the filter gets more and more clogged with particles...even though you can't see them.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    lkalred's Avatar
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    Re: Hello from Wylie! Newb with filter question.

    Thanks duraleigh!
    I guess I will just continue to monitor and backflush.
    Previous owner left cellulose fiber instead of DE. when grids replaced, DE also replaced. As I backflush, should I use the cellulose or get some DE? How much of either should I use?
    250Gal, portable spa, K-2006

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    Re: Hello from Wylie! Newb with filter question.

    I guess I will just continue to monitor and backflush
    When your kit gets in and you get familiar with it, perform the OCLT described in Pool School. If you lose 1ppm or more during the night, you will want to start the shock process.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Hello from Wylie! Newb with filter question.

    Welcome to TFP fellow N. Texan! great advice thus far.

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    lkalred's Avatar
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    Re: Hello from Wylie! Newb with filter question.

    What is the advisability of using cellulose fiber instead of DE?
    250Gal, portable spa, K-2006

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    Re: Hello from Wylie! Newb with filter question.

    Haven't heard too much about using cellulose. It seems to me that DE would filter out finer particles than would the cellulose. That's the main benefit of DE.

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    Richard320's Avatar
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    Re: Hello from Wylie! Newb with filter question.

    Quote Originally Posted by lkalred
    What is the advisability of using cellulose fiber instead of DE?
    I've got no complaints after using it since December 2010. However, my pool was already clear and sparkling when I made the switch. The manufacturers claim it filters to 2 microns as opposed to DE filtering to 4 microns. If true, it will load up even faster than DE in your situation.

    As I see it, the big advantage is that it's biodegradable, so I can backwash onto my lawn without it creating a big crusty DE mess.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    BoDarville's Avatar
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    Re: Hello from Wylie! Newb with filter question.

    What is the advisability of using cellulose fiber instead of DE?
    I use the cellulose fiber during the height of the swim season as an aid to my sand filter. It gives me that little extra bit of clarity that is apparent when the pool lights are on. So far, it has worked well for me. I just need to replenish it after each backwash.

    The primary reason I tried the cellulose instead of DE is because of the breathing hazards of DE and that cellulose is biodegradable.

    In your case, I would focus on getting rid of all the remaining algae and determine if you need to shock. After that, you could consider giving the cellulose a try and see if it works for you.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

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    lkalred's Avatar
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    Re: Hello from Wylie! Newb with filter question.

    I figured out what was causing my filter pressure to rise so quickly.
    Finally did some research re: cellulose and found out that the DE and the cellulose DO NOT react well to each other and will cause high filter pressures and low flow rates if used together.
    So cleaned all DE off grids and put just cellulose in filter, now getting reasonable filter pressure and no rise yet. We'll see if the water also takes on the polished look they talk about
    250Gal, portable spa, K-2006

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