Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 11 of 11

Thread: Main Drain Question

  1. Back To Top    #1

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Main Drain Question

    I was not sure where to put this so please move if in the wrong spot. I have a IG pool. We also have a main drain. I have been in the house for over 2 years and have never figure out how to use the main drain. Have never needed to, but just would like to know how if I ever do. I think I have found the spot where if I need to drain where it drains out, but not how to start the main drain to drain the pool. Anyone have any idea. There is nothing around the pump or anything that just jumps out at me.

    Thanks.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  2. Back To Top    #2
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,486

    Re: Main Drain Question

    In modern pools, the function of a main drain is mainly for circulation although there is some debate as to how much it really helps. Normally, it is much easier to drain a pool with a separate sump pump placed in the deep end.

    But to drain the pool with the main drain requires a specific setup. Mainly, the main drain must be plumbed separate from the skimmer and there must be a way to shut off the flow from the skimmers. Many main drains are plumbed through the skimmer which makes it very difficult to drain that way.

    So do you know if the main drain is plumbed through the skimmer or directly to the equipment pad? You can usually tell by the configuration at the suction side of the pump. If you have only a single pipe into the pump, then the main drain is plumbed through the skimmer and it will be more difficult to drain the pool that way. If you have multiple pipes with valves, then it is likely that you have control of the flow from the skimmers and main drain.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  3. Back To Top    #3

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: Main Drain Question

    Quote Originally Posted by mas985
    In modern pools, the function of a main drain is mainly for circulation although there is some debate as to how much it really helps. Normally, it is much easier to drain a pool with a separate sump pump placed in the deep end.

    But to drain the pool with the main drain requires a specific setup. Mainly, the main drain must be plumbed separate from the skimmer and there must be a way to shut off the flow from the skimmers. Many main drains are plumbed through the skimmer which makes it very difficult to drain that way.

    So do you know if the main drain is plumbed through the skimmer or directly to the equipment pad? You can usually tell by the configuration at the suction side of the pump. If you have only a single pipe into the pump, then the main drain is plumbed through the skimmer and it will be more difficult to drain the pool that way. If you have multiple pipes with valves, then it is likely that you have control of the flow from the skimmers and main drain.
    I want to say through the skimmer, since in the bottom of the skimmer there are two holes, and only one one pipe that comes out that connects to the pump.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  4. Back To Top    #4
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,486

    Re: Main Drain Question

    Yes, it sounds like it is plumbed through the skimmer. There is a way to plumb the two skimmer holes together, temporarily, so that you could drain that way. But it would probably be easier to get a submersible pump if you even needed to drain the pool.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  5. Back To Top    #5
    Malibu07's Avatar
    Join Date
    Jun 2010
    Location
    Southeast VA
    Posts
    207

    Re: Main Drain Question

    is there a drain in the bottom of your pool?
    14,700 gal. 14 x 28 rectangle with 2R IG by Hydra Pools, 1 hp Hayward Maxflow ll, Hayward 24" Sand Filter, Aquarite Electronic SWG, one Aqua Genie Complete Skimmer, two main drains, four returns, 2 spa jets in steps, 30ml Tidewater liner. Taylor K-2006 Test Kit

  6. Back To Top    #6

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: Main Drain Question

    Quote Originally Posted by Malibu07
    is there a drain in the bottom of your pool?
    Yes there is in the deep end.

    I am not looking to drain my pool, was only wondering. We have a drain area where I think the pool will drain to, but not sure. I am thinking of putting a patio in and wanted to make sure this drain area was not for the pool as well.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  7. Back To Top    #7
    Malibu07's Avatar
    Join Date
    Jun 2010
    Location
    Southeast VA
    Posts
    207

    Re: Main Drain Question

    The way mine is set up is, I have two main drains in the deep end. When I go to close the pool or when there are storms in the summer, I use the main drains to pump water out. I connect a blue pool hose to the sand filter and run it across my back yard to a drainage ditch. Then I select "Waste" on top of the sand filter and let some of the water out.
    I guess what you are wondering is if your pool builders put an underground drain line? If you still have your equipment set up, you should have a handle somewhere that lets you select waste, backwash ect. I would set it on backwash just to see where it is draining to.
    14,700 gal. 14 x 28 rectangle with 2R IG by Hydra Pools, 1 hp Hayward Maxflow ll, Hayward 24" Sand Filter, Aquarite Electronic SWG, one Aqua Genie Complete Skimmer, two main drains, four returns, 2 spa jets in steps, 30ml Tidewater liner. Taylor K-2006 Test Kit

  8. Back To Top    #8

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: Main Drain Question

    Quote Originally Posted by Malibu07
    The way mine is set up is, I have two main drains in the deep end. When I go to close the pool or when there are storms in the summer, I use the main drains to pump water out. I connect a blue pool hose to the sand filter and run it across my back yard to a drainage ditch. Then I select "Waste" on top of the sand filter and let some of the water out.
    I guess what you are wondering is if your pool builders put an underground drain line? If you still have your equipment set up, you should have a handle somewhere that lets you select waste, backwash ect. I would set it on backwash just to see where it is draining to.
    I have a DE filter with just one handle. I raise it to backwash, put it down to circulate into the pool. When backwashing it backwashes out into the road. I am not sure if it is being backwashed and the water is going out the main drain or the skimmer. Because when I backwash I have to have the pump on, which I assume it is always done that way.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  9. Back To Top    #9
    CUTiger78's Avatar
    Join Date
    May 2009
    Location
    NoVA
    Posts
    460

    Re: Main Drain Question

    You said you never figured out how to use the main drain.

    You know you need a diverter gizmo in the skimmer to get any suction from the main drain, right?

    My skimmer/main drain is plumbed same as you described. Took me most of the first year to realize what that gizmo was for....
    36K gallon 42X22 gunite/plaster kidney-shaped IG;
    1 hp Hayward Super Pump (new in 2012);
    Hayward S244T sand filter w/ Zeosand (both new in 2009);
    175K BTU LAARS Lite2 LG natural gas heater; Polaris 380;
    TF-100 test kit.

  10. Back To Top    #10

    Join Date
    Mar 2010
    Location
    Spring, TX
    Posts
    1,082

    Re: Main Drain Question

    Quote Originally Posted by CUTiger78
    You said you never figured out how to use the main drain.

    You know you need a diverter gizmo in the skimmer to get any suction from the main drain, right?

    My skimmer/main drain is plumbed same as you described. Took me most of the first year to realize what that gizmo was for....
    Does that just allow you to use your main drain for circulation or to drain? I do not have a diverter, but on another thread saw one.
    13,000 Plaster IG Pool approx
    Hayward C5030 Cart Filter
    Emerson 1081 EB653 1.0 HP 1.40 S.F. 3450 RPM
    Pool Calculator, Pool School, TF Test Kits

  11. Back To Top    #11
    CUTiger78's Avatar
    Join Date
    May 2009
    Location
    NoVA
    Posts
    460

    Re: Main Drain Question

    The design is for circulation, but I've used it to drain my pool about 2 feet below skimmer level.
    36K gallon 42X22 gunite/plaster kidney-shaped IG;
    1 hp Hayward Super Pump (new in 2012);
    Hayward S244T sand filter w/ Zeosand (both new in 2009);
    175K BTU LAARS Lite2 LG natural gas heater; Polaris 380;
    TF-100 test kit.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •