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Thread: Sta-Rite System 3 backwash

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    Join Date
    Sep 2015

    Sta-Rite System 3 backwash

    I am trying to drain some of my pool to lower my CYA. I have a Sta-Rite System 3 two cartridge filter and it has a drain plug on one side. I usually just stick the vacuum hose inside of this plug to divert the water away from my house when I'm cleaning the cartridges. (the hose doesn't fit perfectly, so some water spills out the sides) Now, I'm trying to remove about 5,000 gallons from the pool and was wondering if there was some type of hose I could put into this drain plug that fits exactly? I saw some flat backwash hoses, but i'm not sure how I would attach these since I just have an open hole at the drain plug. Thanks.
    23,000 Gallon Gunite Pool-Chlorine. Sta-Rite System 3.

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    JoyfulNoise's Avatar
    Join Date
    May 2015
    Tucson, AZ

    Re: Sta-Rite System 3 backwash

    The drain plug is likely just standard NPT pipe thread. You could take the plug to your local hardware store and match the diameter and thread pitch to one of many different types of adapters.

    However, given the size limitation of the drain plug, the water flow is going to be exceptionally slow. Why not just rent a submersible pump that's rated at a few thousand gallons per hour and be done with it? Most Lowes and Home Depots have equipment rental departments.

    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Agent99's Avatar
    Join Date
    Aug 2008
    San Jose, CA

    Re: Sta-Rite System 3 backwash


    I have the same filter and this is what I have. That drain is 1 1/2" FPT (female pipe thread). So I got a threaded bushing that was 1 1/2" by 3/4" and screwed it into the drain hole. Next, I screwed in a 3/4" elbow that was threaded on one end and slip (requires PVC glue) on the other into that bushing. I then glued a 3/4" slip by GHT (garden hose thread) so that I could attach an ordinary garden hose. Everything you need is at your closest home center. If the PVC garden hose thread fitting isn't with all the plumbing, try looking in the sprinkler/irrigation section of the store.
    25k IG/Spa Figure 8, 18x36, Pebble Sheen Blue Granite, Sta-Rite S8M150 Cartridge Filter, Pentair 460805 400k BTU Heater & 011018 IntelliFlo VarSpd
    Liquidator, Fafco Solar Heat, Polaris PB460 Booster Pump w/280 cleaner, Katchaleaf Cover, TF100 Test Kit, FAKE MAIN DRAIN

  4. Back To Top    #4

    Join Date
    Aug 2015
    San Jose, CA

    Re: Sta-Rite System 3 backwash

    I just found that mine is plumbed, too:

    I think mine goes to the sewer.

    The submersible pump would probably be faster and require a lot less running of your main pump. With my inefficient old monster, it might save money to rent one.

    A bunch of people on the forum have either rented them or bought one; Harbor Freight apparently has an inexpensive submersible pump and then you have one whenever you happen to need it.
    18,000 gallon in-ground gunite pool, built circa 1965
    single speed pump and booster (old, probably mid-1990's), driving System 3 cartridge filter, old Polaris crawler, and rooftop solar.
    TF-100 test kit.

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