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Thread: D'oh!

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    D'oh!

    I'm not sure how the water flows through a DE filter.....

    I'm guessing the dirty water comes from the pump to the main canister. Then, in the canister, the dirty water pass through the DE layer, through the grid fabric, and then there must be a plastic tube with holes sandwiched in the grid fabric to move the clean water to the top of the manifold where it is collected and returned to the pool?

    Can this be right?
    35,000 Gal. - 40x20x8 - Plaster - SWG Pentair IC 60 - Barracuda G3 Vacuum - Hayward c1750 Cartridge Filter - Blue Torrent VS 1.5hp pump - Pool is 45 years old.

    "I'd build a deck over my pool if I didn't have a SWG"

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    Mod Squad Texas Splash's Avatar
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    Re: D'oh!

    Maybe this thread will help you: DE Filter Cleaning Tutorial

    Are you asking for yourself or a friend? Your signature shows a cartridge filter. Maybe you changed it?
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
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    Re: D'oh!

    Great article but I'm curious to the path the water takes from the inlet to the outlet once inside the canister.

    (it's my neighbor's pool)
    35,000 Gal. - 40x20x8 - Plaster - SWG Pentair IC 60 - Barracuda G3 Vacuum - Hayward c1750 Cartridge Filter - Blue Torrent VS 1.5hp pump - Pool is 45 years old.

    "I'd build a deck over my pool if I didn't have a SWG"

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    Mod Squad Jimrahbe's Avatar
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    Re: D'oh!

    Philo,

    Everything you said was correct except the water does not pass through the grids.. It passes through the DE and into the center of the grids, which are connected to the top manifold. The water then exits the filter as clean as it is going to be..

    Just guessing here, but if DE is getting back into the pool then most likely, one or more of the grids have tears or holes in them..

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Caldera Spa.

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    Richard320's Avatar
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    Re: D'oh!

    Quote Originally Posted by Philo View Post
    Great article but I'm curious to the path the water takes from the inlet to the outlet once inside the canister.

    (it's my neighbor's pool)
    It flows from outside in. It's a commercial, but it has a clear filter housing. Click on this link.
    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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    Re: D'oh!

    Quote Originally Posted by Jimrahbe View Post
    Philo,

    Everything you said was correct except the water does not pass through the grids.. It passes through the DE and into the center of the grids, which are connected to the top manifold. The water then exits the filter as clean as it is going to be..

    Just guessing here, but if DE is getting back into the pool then most likely, one or more of the grids have tears or holes in them..

    Jim R.
    So far so good, but how does the water get from the center of the grid to the top manifold? Holes in a plastic pipe?
    35,000 Gal. - 40x20x8 - Plaster - SWG Pentair IC 60 - Barracuda G3 Vacuum - Hayward c1750 Cartridge Filter - Blue Torrent VS 1.5hp pump - Pool is 45 years old.

    "I'd build a deck over my pool if I didn't have a SWG"

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    Richard320's Avatar
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    Re: D'oh!

    Quote Originally Posted by Philo View Post
    So far so good, but how does the water get from the center of the grid to the top manifold? Holes in a plastic pipe?
    The grid is a skeletal frame covered with fabric and at one end there's a nipple that plugs into the manifold. You can see it clearly here. That little piece of pipe sticking out the bottom. It's just a friction fit.
    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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    Re: D'oh!

    Thanks Richard.
    35,000 Gal. - 40x20x8 - Plaster - SWG Pentair IC 60 - Barracuda G3 Vacuum - Hayward c1750 Cartridge Filter - Blue Torrent VS 1.5hp pump - Pool is 45 years old.

    "I'd build a deck over my pool if I didn't have a SWG"

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    Re: D'oh!

    This might help you visualize it: DE Filter Backwash - YouTube
    Bob - INTEX 12x24 owner (not setup yet), 'New to me' Kreepy Krauly Sand Shark, Test kit: TF-100 w/Speed Stir

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    Mod Squad Texas Splash's Avatar
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    Re: D'oh!

    Maybe this page will help you: Cleaning a DE Filter

    During filter mode, water flows into the filter housing and passes around and through the grids. Water movement is "outside thru inwards" to each grid before being returned to the pool. That way water is cleaned and pushes the DE against the outside of each grid as it passes through them. During backwash, it's the opposite. Water flows directly "into" the grids themselves through that nipple fitting, moving water "inside-outward" of each grid. This also releases some of the DE clinging to the outside of each grid to clean the grids during backwash. That's also why a DE recharge is required after backwash.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: D'oh!

    Thanks for your help but unfortunately I am a product of the Public School System. I don't see how the water gets into the manifold to be returned to the pool.
    35,000 Gal. - 40x20x8 - Plaster - SWG Pentair IC 60 - Barracuda G3 Vacuum - Hayward c1750 Cartridge Filter - Blue Torrent VS 1.5hp pump - Pool is 45 years old.

    "I'd build a deck over my pool if I didn't have a SWG"

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    Re: D'oh!

    I just took one apart.....
    The water flows:
    * Through the DE
    * Through the first layer of fabric mesh
    * The now clean water flows into the interior of the grid system
    * Up the plastic vertical support via numerous open slots all along the support post
    * Into the manifold
    * Out of the filter and back into the pool

    I think......
    35,000 Gal. - 40x20x8 - Plaster - SWG Pentair IC 60 - Barracuda G3 Vacuum - Hayward c1750 Cartridge Filter - Blue Torrent VS 1.5hp pump - Pool is 45 years old.

    "I'd build a deck over my pool if I didn't have a SWG"

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