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Thread: How to drain a cartridge filter pool?

  1. #1
    Junior Member bobhatfield's Avatar
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    How to drain a cartridge filter pool?

    I need to drain about 20% of my pool and refill with tap water to lower CYA. However, it's a closed system with a cartridge filter - no backwash tap. Do I just rig something up such as remove the swg cell and redirect the flow via a backwash hose? I can restrict intake to just the drain with valves. Or is there a better way?
    30K Gallons | Cartridge | In Ground | Plaster | WhisperFlo 2HP | Filter Flow Rate: 150 GPM
    SWG installed - but not working, needs new cell

  2. #2
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    Re: How to drain a cartridge filter pool?

    You may just head up to Home Depot and get yourself a cheapish sump pump and use that. You can rent one, but I am willing to bet that you will need it again at some point. Might as well have your own.
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  3. #3
    Junior Member bobhatfield's Avatar
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    Re: How to drain a cartridge filter pool?

    Quote Originally Posted by 257WbyMag
    You may just head up to Home Depot and get yourself a cheapish sump pump and use that. You can rent one, but I am willing to bet that you will need it again at some point. Might as well have your own.
    I don't know, it's mostly bone dry here in Phoenix.
    30K Gallons | Cartridge | In Ground | Plaster | WhisperFlo 2HP | Filter Flow Rate: 150 GPM
    SWG installed - but not working, needs new cell

  4. #4
    Senior Member phipsi1237's Avatar
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    Re: How to drain a cartridge filter pool?

    I think it costs about $30, maybe less,to rent a pump for 4 hours. Should take about 2 hours to drain 6K gallons once it's running.
    14.5K gal Plaster IGP, Intelliflo VS, EasyTouch 8, SWG, IntellipH, Clear and Clean 420 Cartridge Filter, Attached Spa, H400IDL2 NG Heater

  5. #5
    Junior Member bobhatfield's Avatar
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    Re: How to drain a cartridge filter pool?

    Actually, may not be a bad idea because one could calculate gallons per min instead of eyeballing water level...
    30K Gallons | Cartridge | In Ground | Plaster | WhisperFlo 2HP | Filter Flow Rate: 150 GPM
    SWG installed - but not working, needs new cell

  6. #6
    Senior Member bobodaclown's Avatar
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    Re: How to drain a cartridge filter pool?

    This may help it's what I did with mine:
    adding-a-to-waste-drain-to-plumbing-t35088.html?hilit=drain

    Hope it helps.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, SWCG CPSC48, SmartPool Nitro SmartKleen NC22 robotic pool cleaner, Lakeland Florida

  7. #7
    Member kkendall's Avatar
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    Re: How to drain a cartridge filter pool?

    My PB actually put a hose connection between the pump and filter. There is also a drain plug on the bottom of the filter canister (below the pipe connections). But the pump suggestion would be the way to go if you don't have a hose connection.
    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
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  8. #8
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    Re: How to drain a cartridge filter pool?

    We always install a hose bib on the return side of the filter to make it easy to drain down some water if needed.
    You could cut one in. Not a bad thing to have when we get a big storm and pool is overflowing.
    40'x19' IG Diamond Brite 29K 4' Waterfall/Dive Rock FNS60 DE 2x2hp Whisperflo pumps Aqualogic(P4) SWG TF100 Tester


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  9. #9
    Junior Member bobhatfield's Avatar
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    Re: How to drain a cartridge filter pool?

    Great ideas, I only wish I'd waited to read these before heading to Home Depot. I removed the swg and added this 3" to 1.5" rubber fitting with a piece of PVC to clamp the hose to. It worked great but would rather have the drain plug valve!

    [attachment=0:213rvfzm]image.jpg[/attachment:213rvfzm]
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    30K Gallons | Cartridge | In Ground | Plaster | WhisperFlo 2HP | Filter Flow Rate: 150 GPM
    SWG installed - but not working, needs new cell

  10. #10
    Senior Member In the Industry

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    Re: How to drain a cartridge filter pool?

    That is some nice out of the box thinking.

    And when you are done you can return it all.
    40'x19' IG Diamond Brite 29K 4' Waterfall/Dive Rock FNS60 DE 2x2hp Whisperflo pumps Aqualogic(P4) SWG TF100 Tester


    Pool School, Pool Calculator,TFTestKits,

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