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Thread: NEWBIE - Polyquat vs Algae Back Up

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    h2ctpdjl's Avatar
    Join Date
    Jul 2008

    NEWBIE - Polyquat vs Algae Back Up

    I have done the BBB switch and plan to add the "closing" chemicals to my pool before my PS comes to do the actual closing for me. I am wondering about the Polyquat. I currently have lots of unused PS chemicals, one of which is Biogard Algae Back Up. According to the label, it is a broad spectrum algae preventative, consisting of Alky (C 14, 95%; C12, 3%; C16, 2%) dimenthyl benzyl ammonium chloride - 30% and Alkyl (C12, 61%; C14, 23%, C16, 11%; C8 & C10, 2.5%; C18, 2.5%) dimethyl benzyl ammonium Chloride - 10%. I am not a chemist, but hopefully someone who has that wonderful knowledge can tell me if it can be used instead of the polyquat. If it is NOT as good, I will get the Polyquat. My pool is in wonderful shape and I don't want to mess it up now. I use my heater in the fall and don't close it until mid October. Also, if I have been reading the multiple threads about pool closings correctly, there are different kinds of Polyquat? a 60, 30, etc? Which would I use if my Back Up is not sufficient? KEEP UP THE GOOD WORK!!!!!!
    18,000 gal, 18x32 IGP, vinyl liner, 3 to 5.5ft depth. One inlet/skimmer (Aqua Genie), one main drain. Hayward Pro Series Sand Filter w/filtration rate of 20 GPM/FT, Two-Speed Pentair Whisperflo 1 HP pump, Natural Gas Hayward H200 pool heater, Aquabot T2 (200 Series) Robotic Pool Cleaner (my best friend), Automatic Electric Pool Cover (2nd best friend).

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: NEWBIE - Polyquat vs Algae Back Up

    That is a combination of two linear-quats. It will tend to foam and can smell bad.

    Polyquat is most commonly sold in a 60% concentration, but is also available at half strength, 30%. If you get the 30% version you need to use twice as much.
    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

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