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Thread: Theory as to reason for filter blow-up

  1. Back To Top    #1
    Prav's Avatar
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    Nov 2010
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    Theory as to reason for filter blow-up

    So, as I said in this post my filter exploded. The most plausible explanation was that it was just its time. So, after looking around and asking for some feedback, I went with the Hayward 1750 (though the PS thought it was way too big and I should have done 1200 - but for an extra $80, I followed the TFP tenet of oversizing).

    So, FiL and I did a pretty good job of plumbing it in. Probably took 3x-4x what PB would have taken, but whatever. And we're about to turn it on.... let me digress a moment: all that time, the new heat pump which was plumbed in last weekend (Sunrunner/Aquapro 1300) had been flashing "LP". Didn't think anything of it because there was no flow... in hindsight, the message for no flow should have been "FLO"; "LP" means either ambient temp is less than 60 (hardly, MIA was well over 80 today) or low refrigerant pressure.

    Anyway, I turn on pump on, and there are no leaks in our piping. Job well done! Then we step back, and the output from the HP back to the pool is leaking and the area is oily to the touch.

    What could have possibly caused loss of refrigerant.... and, could that have been the cause of whatever clog/pressure buildup that blew up my filter? The way I see it, whatever messed up the HP (which was running when the incident took place) and caused the loss of refrigerant blew out the pipes into the filter, cracked it, and messed up the output from the HP. Possible?

    Of course, I would expect Leslie's to make good on fixing (even replacing) a 3-day old HP. The question would be: could I make some connection between that and the filter blow up? Granted, the filter was easily 10 years old and maybe on its last legs, but it had been working just fine until the HP got connected and LP came up.

    The only thing Leslie's did not do was do the electrical, but if there was something wrong there, a breaker would have tripped or a fuse blown - not refrigerant going missing.

    Meanwhile, pool is still sparkling clean. Even with the leak, I let the pump run for 2 hours just to get the water moving. Water still tested OK (FC 4 on a 60 CYA), so I did add plenty HOCl for another 2-3 days of no circulation. I did notice some cloudiness perhaps even oily sheen from the returns as it ran - is that normal on new cartridge, or is that refrigerant getting in the water?

    As always, thanks in advance for comments/feedback.
    14'x30' (est. 14K gal) w/spillover spa (est. 500 gal) - 1995 // Diamond Brite Blue Quartz - 2006
    Hayward SwimPure Plus T-15 - 2013 // Zodiac MX-8 - 2013
    Plain ol' Intermatic mechanical timer // Pump: 1 HP Pentair SuperFlo - 2012
    Filter: Hayward C17502(S) Cartridge Filter - 2011 // Heat Pump: Sunrunner/Aquapro 1300 (127K BTU) - 2011

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    guamguy's Avatar
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    Re: Theory as to reason for filter blow-up

    I would say the oil slick is from the heat pump. It sounds like the heat exchanger ruptured, causing refrigerant (and oil) to go into the pool water flowing through it.
    12,800 gallon IG plaster kidney-shaped pool, waterslide, 800 gallon spa.
    1HP 2 speed Sta-Rite pool pump, 1.5 HP Sta-Rite spa jet pump. 2 skimmers, 1 main drain
    Purex-Triton TR-60 325 lb.sand filter. 2" Plumbing, Intex SWCG, TF-100 test kit.
    Link to pics of my pool! http://www.troublefreepool.com/my-oasis-t26558.html

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    JasonLion's Avatar
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    Re: Theory as to reason for filter blow-up

    If the heat pump completely blocked the flow of water at some point, which is very unlikely, there would have been a significant amount of extra pressure on the filter. Still, the filter is designed to withstand more pressure than the pump can produce, so even then it should have been fine.

    Even with the heat pump working perfectly, it would have added a very small amount of extra back pressure. That extra pressure could in theory have aggravated some pre-existing problem, resulting in the timing of the explosion. Still, there needs to have been something wrong with the filter in the first place, or it never would have failed like that.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  4. Back To Top    #4
    Prav's Avatar
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    Re: Theory as to reason for filter blow-up

    Agreed on filter pre-existing problem.

    As for the possible heat exchanger rupture: gotta be a manufacturing defect, right?
    14'x30' (est. 14K gal) w/spillover spa (est. 500 gal) - 1995 // Diamond Brite Blue Quartz - 2006
    Hayward SwimPure Plus T-15 - 2013 // Zodiac MX-8 - 2013
    Plain ol' Intermatic mechanical timer // Pump: 1 HP Pentair SuperFlo - 2012
    Filter: Hayward C17502(S) Cartridge Filter - 2011 // Heat Pump: Sunrunner/Aquapro 1300 (127K BTU) - 2011

  5. Back To Top    #5
    JasonLion's Avatar
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    Re: Theory as to reason for filter blow-up

    It sure sounds like it. Nearly any failure within the first couple of days is going to be from manufacturing or materials problems.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  6. Back To Top    #6
    Ohm_Boy's Avatar
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    Re: Theory as to reason for filter blow-up

    Also think that there was something wrong with the filter, and the structural integrity was in deficit. I also believe that there was probably a good bit of air in it, for it to blow out like that.
    [center:1kpalu48]Helpful Links: Pool School | CYA/Chlorine Chart | Pool Calculator[/center:1kpalu48]

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