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Thread: How does one plumb an AGP maindrain to a skimmer?

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    mariane's Avatar
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    How does one plumb an AGP maindrain to a skimmer?

    We installed our pool and put a main drain in the deep end 9 years ago but never cut the liner, nor plumbed it into the filter. It is just a pipe sticking out of the ground right now.
    Is there a way to plumb it so that the debris from the bottom does not go directly to the pump but maybe thru a skimmer basket first? On the install instructions, it shows it would bypass the skimmer and go directly to the pump, but first going thru a 3 way valve. It seems a lot of crud would go into the filter while pushing the stuff into the drain, resulting in more frequent backwashing. I have to admit I almost never have to backwash since we use a skimmer sock all the time, and the pressure really never seems to go up.
    What do you all think?
    Thanks!
    16 x 28 Doughboy Mystic Garden AGP with 7' deep end (used expandable vinyl liner) ~11,800 gals. Deep end main drain. Thru-the-wall skimmer, one return at deep end. Media Master 150# sand filter. Doughboy PowerPak II pump, 1 hp. Pentair MinimaxCH 150m natural gas heater. Polaris 65 when it feels like working . TF-100 test kit. No longer 'pool stored' 5 years and counting. In sunny but fickle metro-Detroit.

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    Richard320's Avatar
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    Re: How does one plumb an AGP maindrain to a skimmer?

    Won't work. The laws of physics won't allow the water to climb up the pipe above the skimmer basket and flow. It has to be connected to suction somehow. As long as you have good skimmer action, there shouldn't be that much stuff hitting the floor of the pool anyway. And a main drain doesn't draw all that fast, either. I can brush debris - a flower petal, perhaps - straight at the main drain and unless it hits one of the openings straight on, it will just pass over the top. It has nothing like the velocity of the skimmer. The skimmer is limited to the width of the throat and maybe 1/2" deep over the weir. Just to keep the same water level after the pump empties the skimmer requires a lot of movement. But the drain has several feet of water just gravity feeding into it. You won't see stuff being drawn into the drain the way surface debris gets drawn into the skimmer.
    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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    mariane's Avatar
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    Re: How does one plumb an AGP maindrain to a skimmer?

    Thanks Richard.
    Others have posted that they bring all the debris to the middle of the pool where it would be picked up by the middle main drain. Is that a better idea? I'm wondering what happens to the debris that people have said they just open the main drain and push it in there. Will it clog the drain? Will bigger debris clog the pump basket before it gets to the filter? Would this cause a problem with the pump?
    16 x 28 Doughboy Mystic Garden AGP with 7' deep end (used expandable vinyl liner) ~11,800 gals. Deep end main drain. Thru-the-wall skimmer, one return at deep end. Media Master 150# sand filter. Doughboy PowerPak II pump, 1 hp. Pentair MinimaxCH 150m natural gas heater. Polaris 65 when it feels like working . TF-100 test kit. No longer 'pool stored' 5 years and counting. In sunny but fickle metro-Detroit.

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    Richard320's Avatar
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    Re: How does one plumb an AGP maindrain to a skimmer?

    I've never had any problems. But I don't try brushing everything into the drain in lieu of vacuuming. It's usually just a few stray bits that decided to appear moments after I've coiled up the hose.
    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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    mariane's Avatar
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    Re: How does one plumb an AGP maindrain to a skimmer?

    Thanks for the input. We've been without one for so long and just making sure it will work. ;o)
    16 x 28 Doughboy Mystic Garden AGP with 7' deep end (used expandable vinyl liner) ~11,800 gals. Deep end main drain. Thru-the-wall skimmer, one return at deep end. Media Master 150# sand filter. Doughboy PowerPak II pump, 1 hp. Pentair MinimaxCH 150m natural gas heater. Polaris 65 when it feels like working . TF-100 test kit. No longer 'pool stored' 5 years and counting. In sunny but fickle metro-Detroit.

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