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Thread: 20,000 Pool with old system

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    mh_jenkins's Avatar
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    20,000 Pool with old system

    I have a 20,000 gal pool and the old single speed 7 year old motor just died. The system uses 1.5 in pipes with 2 skimmers and one main drain. Here are my concerns.

    1. The Tagelus sand filter is rated at 40 GPM when my pool should have at least a 42 GPM flow capacity.
    2. The filter valve is old style and leaky. I replaced gaskets and valve last year but still not a solid valve and requires me to resettle the position of the valve to stop leaks.
    3. The motor is dead, single speed and was an electrical HOG.
    4. The pump assembly is a flip top and works ok. Have trouble with the flip top gasket from time to time.

    I am considering replacing individual components, but maybe replacing it all makes since.

    Pictures added.

    Advice please?
    Attached Images Attached Images
    3rd season: 20,000 Gal, IG, vinyl, Sand Tagelus TA40/400 01-L 6 way valve, Emerson 1081 3450RPM motor with Hayward self priming pump housing, Pool built 1997, TF-100 Test Kit , 2009 Plastimayd 20 mil liner (fading), with safety pool cover, Intermatic Mechanical Timer that haven't figured out yet, Pole/hose vac/brush/leaf rake
    --Mike

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    bmoreswim's Avatar
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    Re: 20,000 Pool with old system

    Personally, I'd bite the bullet and replace the filter and pump with a good quality Pentair or Hayward set of equipment just to get rid of all those pesky/annoying issues and also the bigger ones of course. That pump was not only inefficient but also much louder than a new 2-speed pump will on low (which is what it will be on most of time). Though I'm sure there are cheaper approaches too.

    We'd love to see an overall shot of your pool area.
    18'x38' Rectangle (3'-8 1/2' deep w/ diving board) - 27K gal. w/ gray plaster
    Hayward equipment (cartridge filter, 2-speed pump, SWCG, automation) View Our Build
    Coverstar automatic pool cover | StoneMakers concrete retaining wall and decking
    Spring 2013 Build | Dolphin Active 20 robot cleaner | Support TFP!

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    Mod Squad JVTrain's Avatar
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    Re: 20,000 Pool with old system

    Quote Originally Posted by mh_jenkins View Post
    I have a 20,000 gal pool and the old single speed 7 year old motor just died. The system uses 1.5 in pipes with 2 skimmers and one main drain. Here are my concerns.

    1. The Tagelus sand filter is rated at 40 GPM when my pool should have at least a 42 GPM flow capacity.
    2. The filter valve is old style and leaky. I replaced gaskets and valve last year but still not a solid valve and requires me to resettle the position of the valve to stop leaks.
    3. The motor is dead, single speed and was an electrical HOG.
    4. The pump assembly is a flip top and works ok. Have trouble with the flip top gasket from time to time.
    1. - How did you arrive at the need for 42 GPM required for your pool?

    2 - 4. Looks like you need to replace the pump. It would be cheaper to only replace the dry end of the pump, but sounds like you don't like the wet end either so a full replacement would be a better result. CERTAINLY look at a two-speed or variable speed pump for replacement. A 3/4 to 1 HP would be enough for your pool. On the filter valve... you could either just replace the valve or replace the entire sand filter. I would look at costs of doing each and if you feel the replacement valve will be as durable as perhaps switching to another brand with a better/newer MPV design.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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    mh_jenkins's Avatar
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    Re: 20,000 Pool with old system

    Thanks for the info. bmoreswim attaching picture. JVTrain, I got 42 GPM from another web site, calculated by assumption to cycle all 20,000 gal of pool water in 8 hours.... 20,000/8 = 2500 GPH, 2500 GPH/60 = 42 GPM. However not sure if this is a true requirement.
    Attached Images Attached Images
    3rd season: 20,000 Gal, IG, vinyl, Sand Tagelus TA40/400 01-L 6 way valve, Emerson 1081 3450RPM motor with Hayward self priming pump housing, Pool built 1997, TF-100 Test Kit , 2009 Plastimayd 20 mil liner (fading), with safety pool cover, Intermatic Mechanical Timer that haven't figured out yet, Pole/hose vac/brush/leaf rake
    --Mike

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    bmoreswim's Avatar
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    Re: 20,000 Pool with old system

    Pump run time is a factor of several things:

    Chlorination needs if using a SWG
    Mixing of chemicals
    Keeping the water clear
    Keeping the surface skimmed

    Most people run their pump more than needed to do the above. Often only a few hours a day are needed.

    Turnover of water is not one of the factors to determine pump run time (though it is a common/well ingrained misconception).

    Beautiful backyard...thanks for sharing.
    18'x38' Rectangle (3'-8 1/2' deep w/ diving board) - 27K gal. w/ gray plaster
    Hayward equipment (cartridge filter, 2-speed pump, SWCG, automation) View Our Build
    Coverstar automatic pool cover | StoneMakers concrete retaining wall and decking
    Spring 2013 Build | Dolphin Active 20 robot cleaner | Support TFP!

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    mh_jenkins's Avatar
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    Re: 20,000 Pool with old system

    Yes agreed, the current system looses suction and when autostarting the pump it taxes the pump to regain suction so I have been manually starting stopping it each day.

    I like your list
    Chlorination needs if using a SWG
    Mixing of chemicals
    Keeping the water clear
    Keeping the surface skimmed

    And, now that my motor has burned up, vacuuming the bottom of the pool will be an issue in about a week.
    3rd season: 20,000 Gal, IG, vinyl, Sand Tagelus TA40/400 01-L 6 way valve, Emerson 1081 3450RPM motor with Hayward self priming pump housing, Pool built 1997, TF-100 Test Kit , 2009 Plastimayd 20 mil liner (fading), with safety pool cover, Intermatic Mechanical Timer that haven't figured out yet, Pole/hose vac/brush/leaf rake
    --Mike

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    bmoreswim's Avatar
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    Re: 20,000 Pool with old system

    Funny on your motor (not really) I'm on day 6 without a motor. Still clear but I am manually chlorinating and have my autocover closed for cleanliness (and now warmth retention again).
    18'x38' Rectangle (3'-8 1/2' deep w/ diving board) - 27K gal. w/ gray plaster
    Hayward equipment (cartridge filter, 2-speed pump, SWCG, automation) View Our Build
    Coverstar automatic pool cover | StoneMakers concrete retaining wall and decking
    Spring 2013 Build | Dolphin Active 20 robot cleaner | Support TFP!

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