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Thread: PolyQuat vs Benzyl Chloride

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    PolyQuat vs Benzyl Chloride

    Whats the difference between Benzyl ammonium chloride 1227 and a polyquat 60? Mode of kill? Are both chemicals suitable for pool use? and if so which of the mentioned should i really be using?

    Is this a Polyquat? Poly[oxyethylene(dimethyliminio)ethylene(dimethylimino)ethylene dichloride]
    27,500gal IG plaster that needs recoating/painting!, Pentair Whisper-flo 1hp 2 speed, 48sf DE, Pentair Legend II pressure-side cleaner, BBB newbie

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    Re: PolyQuat vs Benzyl Chloride

    We recommend polyquat algaecides for several reasons. You can search the boards, or, more likely, someone will come along and explain things for you.

    Yes, that is polyquat. There should be a number after the long word.... it usually comes in 30% and 60%. 60% is twice as strong.

    8200 gallon 20' x 48" round vinyl frame pool,
    Intex SWCG, 12" sand filter, 1600gph pump, TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, Chlorine/CYA Chart
    "Shock" is a process, not a product!

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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: PolyQuat vs Benzyl Chloride

    The benzyl ammonium chloride is also known as Alkyl dimethyl benzyl ammonium chloride and is a "linear quat". It is less expensive than PolyQuat and will generally inhibit algae growth, but it can foam and doesn't usually last as long so isn't quite as effective. Even with PolyQuat you would need to add it weekly if you were using it for maintenance. PolyQuat doesn't foam, lasts longer, and is reasonably effective for maintenance which is why we recommend it for special circumstances such as the ascorbic acid treatment when your Free Chlorine (FC) level will intentionally get to zero for a time. PolyQuat can be used as extra insurance at other times, but is not necessary because chlorine alone (actually, the appropriate FC/CYA ratio) will prevent algae growth by itself without the need for any extra algaecide.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Join Date
    Mar 2007
    Coastalish 'down easter'

    Re: PolyQuat vs Benzyl Chloride

    If you have a SWCG, use the poly NOT the linear The linear quat will form a sheet of white foamy chunks on the surface with salt levels > ~ 2000 ppm.
    Luv& Luk

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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