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Thread: Surprised when adding anti-freeze to return line

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    Surprised when adding anti-freeze to return line

    Thanks to the great feedback I received on another thread in the Pumping Station, I was able to solve the problem of accessing my Polaris return line to add anti-freeze. However, I got some unexpected results and want to see if anyone else experience this.

    After blowing out the lines, they were wet capped after bubbling for about a minute. When adding anti-freeze to my Polaris return, I was surprised when after only 2 gallons, it started backing up and coming back out at me. I calculated that the line, which is approx. 45 feet, should hold at least 4 gallons. So I stopped adding and went out about an hour later and was able to add more anti-freeze to the line.

    I'm guessing some sort of air pocket that somehow relieved itself over time was causing this. Does this explanation make sense? Of course, I was concerned the return had water in it (2 gallons) but the fact that an hour later I could add more anti-freeze led me believe it was air.

    Anyone experienced this before?
    TF-100 Test kit, 24,000 gal. free form Vinyl. mybluepool AC-600 SWG, STA-RITE S7MD60 DE filter, 3/4 HP STA-RITE MPRA6D pump, Polaris 280 w/booster, Raypack Propane heater, Looplock mesh cover; All located in New England.

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Surprised when adding anti-freeze to return line

    Depending on how the plumbing is ran it certainly could have air locked and then slowly relieved itself. I wouldn't be concerned at all.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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