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Thread: Adding a bottom drain line to DE filter

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    Join Date
    May 2010
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    Adding a bottom drain line to DE filter

    All-

    Have a 60sqft FNS Plus DE filter. As I'm changing out my pump while I'm having the pool resurfaced, figured I'd take the time to do something I've always wanted to do- add a drain line to the bottom drain plug. It's a standard 1.5" tapered thread, and the plug has got an o-ring on it. I'm assuming the o-ring is there a) because of the pressure involved and 2) because the threaded area is "short" and there's less of a chance of a good seal.

    The major issue here is vertical clearance. The most compact combination I can get is with a male-to-slip and then a 90 degree street elbow- but it's still too tall. I need to do more research on specialty connectors online to see if I can make this work. I would rather not have the filter on a raised base simply because of the multiport valve in place and all the plumbing I'd have to re-do.

    Any one have success with this? Especially on the connection to the filter base threads- possibly cementing in place?

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    Richard320's Avatar
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    Re: Adding a bottom drain line to DE filter

    Since it's a drain and not actually used for circulation, couldn't you just replace the plug with a reducer, then stick a 1/2 or 3/4 elbow on that and bring the piping out and around?? The shutoff valve would be cheaper than a 1 1/2, too.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: Adding a bottom drain line to DE filter

    Actually, yes! I just needed to go online for a variety of reducing bushings that the local big boxes didn't have

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    Re: Adding a bottom drain line to DE filter

    Since the water will contain de, a smaller diameter is more likely to get clogged up. You should be able to use a 1.5 -inch male adaptor and then glue in a street 90.

  5. Back To Top    #5

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    May 2010
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    Dallas, TX
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    Re: Adding a bottom drain line to DE filter

    Good call on the clogging. Male adapter + street 90, though, is already way too tall unfortunately. What I need is a reducer bushing with npt on the outside and slip on the inside (so basically the male adapter but bushing-style so it's a shorter fitting). Perusing the manufacturer sites as we speak

    Thanks all!

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