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Thread: WARNING: Don't overtighten a filter canister drain plug

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    tucsontico's Avatar
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    WARNING: Don't overtighten a filter canister drain plug

    I went to bed with my pool looking like this:


    Woke up to it looking like this:



    Yep, I lost over 4 feet of water during the night! My pump was set to run for 2 hours after sunset so this drainage occurred in just 2 hours! I discovered this morning that the drain plug for the filter canister had broken off and the pump sent 18,000+ gallons of water out into my backyard. The good news is, I was here to prevent any further loss when the pump tried to restart this morning!

    My guess is I over-torqued the drain plug when I recently cleaned the filters (Aug 30) and the plug finally snapped in half at the base of the threads. The moral of the story is: DO NOT over tighten a drain plug!
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    19,500 gal, 16' x 38' PebbleTec IG Pool, Built 4/2013; Pentair IntelliFlo VS 3050 3 HP Pump, Pentair Intellichlor IC40 SWG, Pentair IntellipH, Pentair 520 sq ft/150 GPM Cartridge Filter, A&A In-Floor Cleaner, Dolphin Nautilus Plus Robot (aka "Robbie"), Pentair EasyTouch Power Panel w/ Quick Touch 4 Remote Control, Autelis WiFi controller, Clear 12 mil Solar Cover on Presto SS Reel, Taylor K-2006 Test Kit.

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    Mod Squad jblizzle's Avatar
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    Re: WARNING: Don't overtighten a filter canister drain plug

    Oops
    I have had 2 incidents myself:
    Previous house I had my filter crack and drain the pool nearly 100%.
    Current house I had the multi-valve not seat completely after backwashing and drain about 60% of the pool.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    tucsontico's Avatar
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    Re: WARNING: Don't overtighten a filter canister drain plug

    Quote Originally Posted by jblizzle View Post
    Oops
    I have had 2 incidents myself:
    Previous house I had my filter crack and drain the pool nearly 100%.
    Current house I had the multi-valve not seat completely after backwashing and drain about 60% of the pool.
    Yep, totally sucks because I had the water just perfect. Anyway, allows me to clean some scale off the tiles while it refills!
    19,500 gal, 16' x 38' PebbleTec IG Pool, Built 4/2013; Pentair IntelliFlo VS 3050 3 HP Pump, Pentair Intellichlor IC40 SWG, Pentair IntellipH, Pentair 520 sq ft/150 GPM Cartridge Filter, A&A In-Floor Cleaner, Dolphin Nautilus Plus Robot (aka "Robbie"), Pentair EasyTouch Power Panel w/ Quick Touch 4 Remote Control, Autelis WiFi controller, Clear 12 mil Solar Cover on Presto SS Reel, Taylor K-2006 Test Kit.

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    Re: WARNING: Don't overtighten a filter canister drain plug

    Ouch -- non-pool but related, check your toilet connector hoses; many attach to the tank with a similar kind of plastic nut, and if overtightened can split at the base of the threads the same way. We had a neighbor who's 3rd-story bathroom one burst right after they closed on the house; I noticed water pouring from the siding both front and back, and luckily was able to contact the real estate agent (and shut off the water). Still was a *lot* of damage and rebuilding, and that was before they moved furniture in.

    There are a couple of styles -- ours had white plastic nuts that appeared to be 2 pieces glued together at the base; I replaced with ones that have a grey nut that seems to be single piece. I wonder how the drain plugs are made. Either way though, overtightening can put stress on the cap.

    To stay on topic, I had to ask my wife not to take the Polaris cleaner out of the pool without disconnecting it from the wall; I had visions of 5000 gallons of water pumped onto the lawn when the timer activated the next morning before we realized.
    21000gal IG plaster, Sacramento CA area (late 1950s/early 60s)
    Filter: Cartridge, Pentair CCP420 (2014)
    Main pump: Pentair IntelliFlo VS (2015)
    Boost pump: 3/4hp (2011), Polaris 280 cleaner (unknown age)

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