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Thread: Main drain~ is it really needed

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    jlsl95's Avatar
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    Jul 2011
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    Main drain~ is it really needed

    As I'm getting ready to order skimmers and returns for our pool build, I thought I would ask about main drains. I always assumed you had to have one, but I've read where some think they aren't needed. Should we put one in or not?
    Stephanie and Jerry
    DIY concrete block 25 x 50 vinyl pool, now hired out to finish, build in progress, cover star auto cover, 3 laminar deck jets, Inter Fab G force slide
    My Build~~~ http://www.troublefreepool.com/threa...(lots-of-pics)

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    JasonLion's Avatar
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    Re: Main drain~ is it really needed

    No, not need. A main drain is nice, except when winterizing, but hardly essential.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Main drain~ is it really needed

    Needed? No. Beneficial? Yes, for quicker turn over of water through your filter and fewer pockets of poor circulation.
    26,000 gal 18x36' IG Vinyl Pool - Hayward S244T Sand filter - Hayward Tri-star 2-speed 1.5HP pump - Goldline Aqua Plus SWCG and Controller with Tcell-15 - Aquacomfort 125K BTU Heatpump - Hayward Color Comfort 4.0 LED - Zodiac MX8 suction cleaner - TF100 test kit
    My Build thread

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    Mod Squad JohnT's Avatar
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    Re: Main drain~ is it really needed

    I have main drain, and would install one again if I did it over. I'd also have two skimmers so that when the wind shifts I wouldn't have debris hanging around the diving board. Completely separate plumbing for each source to the equipment pad.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    mas985's Avatar
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    Re: Main drain~ is it really needed

    About the only thing a main drain offers is better circulation in the deep end. However, that can be accomplished by other means (i.e. lower returns or a lower wall port) so as others have pointed out, not entirely necessary. I have one but don't use it much since I have a suction side cleaner which is much better at circulation.

    But one of the biggest mistakes people make on this forum is in trying to clean up a pool by pushing debris to the main drain which usually ends up clogging the 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

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    Re: Main drain~ is it really needed

    when i bought my current house nine years ago it didn't take me long to discover that the main drain to my approx. 50 year old pool didn't work - it had a metal cover over it but the screws had rusted out - periodically i would notice a sulphur-like smell of sewage in the deep end - finally dumped some hydraulic cement in it and smoothed over the drain last fall when i did prep for painting the old cement pond

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    Re: Main drain~ is it really needed

    i simply keep the pump/filter running 24/7 for circulation

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    jlsl95's Avatar
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    Re: Main drain~ is it really needed

    Thank you!
    Stephanie and Jerry
    DIY concrete block 25 x 50 vinyl pool, now hired out to finish, build in progress, cover star auto cover, 3 laminar deck jets, Inter Fab G force slide
    My Build~~~ http://www.troublefreepool.com/threa...(lots-of-pics)

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