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Thread: using 2 filters for 1 pool

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    In the Industry

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    using 2 filters for 1 pool

    I have a 15,500 pool
    Solar panels
    Vaccuum on same line
    True 1.5 hp pump
    Getting great flows now

    I have a Hayward C900 filter on the system. It does a good job but needs to be cleanned quite frequently anywhere for 1 to 2 time a week. (Ok I admint I like to see it clean)

    I was using a DE tank prior to swithing over to the cartridge tank.
    DE seemed to keep it much cleaner to me.

    I am thinking about adding another C900 cartridge filter in line with the other filter. Therefore having 2 filters for this one pool.

    I dont think I will have any problems maintaining a good psi as I run 20 to 25 psi now. Thats normal for my pool as I have a steap rise to the solar panels. I know its at the top of the chart for reccomended psi in this filter bit It does ok with it . Has not blown out a filter yet.

    Is there any value to adding the extra filter or just a waste of energy and money.

    Thanks

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    Melt In The Sun's Avatar
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    Re: using 2 filters for 1 pool

    I don't think it would accomplish anything. The first filter would catch everything and get dirty. The second filter would probably remain clean, since anything big enough to get caught already is stuck in the first filter.
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
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    Mod Squad Bama Rambler's Avatar
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    Re: using 2 filters for 1 pool

    I don't think you'd help yourself by running them inline (series). However if you ran them parallel you'd effectively double your filter area. The added benefit of this would be that you'd reduce the head across them too (at least until they got plugged).
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: using 2 filters for 1 pool

    Quote Originally Posted by StuartPool
    It does a good job but needs to be cleanned quite frequently anywhere for 1 to 2 time a week. (Ok I admint I like to see it clean)

    I was using a DE tank prior to swithing over to the cartridge tank.
    DE seemed to keep it much cleaner to me.

    I am thinking about adding another C900 cartridge filter in line with the other filter.
    If DE kept it cleaner, why add a second cartridge? Why not go back to DE?
    24' x 52" AGP = 13.5k gallons
    Dynamo 2.0 HP pump,Sand Dollar sand filter
    Polaris 65 vacuum (good when there are a ton of leaves on bottom), Pool Rover Jr. (LOVE it, but power box dead right now), AquaCritter (an excellent suction side cleaner)

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    Re: using 2 filters for 1 pool

    If DE kept it cleaner, why add a second cartridge? Why not go back to DE?
    Our filter went bad. Took the advise of a sales person for ease of use.

    I don't think you'd help yourself by running them inline (series). However if you ran them parallel you'd effectively double your filter area. The added benefit of this would be that you'd reduce the head across them too (at least until they got plugged).
    Not quite sure what you mean inline vs parrallel

    as it is

    in from pool --- pump ---out to filter -- up to solar--down to pool

    as it would be setup

    in from pool --- pump ---out to filter --in to 2nd filter --- up to solar--down to pool

    Thinking more about it I dont think it would matter much since the first filter has its micron filter limits. Guess if the first filter was not as efficient as the second there would be some benefit.

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    Mod Squad Bama Rambler's Avatar
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    Re: using 2 filters for 1 pool

    The way you explain it would be series (one behind the other flow wise) and you're right, unless the second filter in the series is smaller mesh than the first it'll not catch anything because the first will get it all.

    Parallel won't filter any finer it just places the two filters side by side in the stream so you could go longer between cleanings.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Melt In The Sun's Avatar
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    Re: using 2 filters for 1 pool

    The sketch below shows parallel vs. series. This is for electricity, but the concept is the same. Battery = pump, lamps = filters.
    Attached Images Attached Images
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

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    Re: using 2 filters for 1 pool

    Quote Originally Posted by Melt In The Sun
    The sketch below shows parallel vs. series. This is for electricity, but the concept is the same. Battery = pump, lamps = filters.
    Very good info there.
    I think that I might have problems with balancing the water flow through each canister and I really dont want to make it that complex, so unfortunatly Im just going to have to clean as I always did lol
    Guess it was a good thought, at least to me
    Thanks

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    Re: using 2 filters for 1 pool

    Quote Originally Posted by StuartPool
    Quote Originally Posted by Melt In The Sun
    The sketch below shows parallel vs. series. This is for electricity, but the concept is the same. Battery = pump, lamps = filters.
    Very good info there.
    I think that I might have problems with balancing the water flow through each canister and I really dont want to make it that complex, so unfortunatly Im just going to have to clean as I always did lol
    Guess it was a good thought, at least to me
    Thanks
    I don't think you'd need to worry about balance. If one filter were getting more flow, it would get dirty faster and start building pressure, which would bias flow towards the other filter. I imagine it works the same way inside a filter with multiple carts.
    20,000 Gallon kidney sort of a sand filtered gunite in ground pool w/ hot tub.

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