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Thread: Leslie test kit aging rate. Interesting.

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    morzh's Avatar
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    Leslie test kit aging rate. Interesting.

    As I wrote in another thread I tested the two Leslie blue box test kits side by side, one is freshley bought and one is 10 years old (2005). The only different reading was FC, and I suspected the #2 chemical. So tonight I tested it using #1 from the old kit and #2 from the new and the reading came out exactly the same.
    So, in 10 years the only chemical that aged sems to be #2.

    Again, cannot claim anything, if anyone is interested how it was kept, it was kept in my garage where it is never really hot. Closed.

    Make of it what you will.
    Seasonal World rectangular pool, 27K gallons (data sheet), 25.3K calculated
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    Divin Dave's Avatar
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    Re: Leslie test kit aging rate. Interesting.

    Hi morzh.
    I dont know anything about the Leslies blue test kit, or the regents.

    I do know however that in the taylor kit and TF100, the only regents which go bad, are the dyes, for testing TA and CH.
    That typically is a 18 month period.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    morzh's Avatar
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    Re: Leslie test kit aging rate. Interesting.

    Yes, the dye. I think #2 is DPD which is what forms the magenta color.
    Seasonal World rectangular pool, 27K gallons (data sheet), 25.3K calculated
    Jandy Stealth JHPU 2.0 PUMP, 2HP
    Jandy CL340 cartridge filter
    Pentair C320 inline chlorinator
    AquaComfort heatpump heater

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    Re: Leslie test kit aging rate. Interesting.

    Generally speaking, it is the organic dyes that are the most sensitive. The FAS reagent is also sensitive especially to heat and sunlight. The acids and bases will last an extremely long time. The other ingredients are intermediate. See this post. The "3 years or more" is being very conservative since those compounds don't degrade. DPD is the most sensitive, though it lasts longer in powder form than as a liquid (so exposure to moisture degrades it).
    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
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    morzh's Avatar
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    Re: Leslie test kit aging rate. Interesting.

    I think it is from similar group of chemical (as it is paraphenylenediamine) as the old color developing reagent, T32, ethyl-oxy-ethyl-paraphenylene-diamine-sulphate, or the older one, di-ethyl-paraphenylene-diamine-sulphate, and they also did degrade over time, after 3 or so years they would develop but the colors would not be as bright.
    Seasonal World rectangular pool, 27K gallons (data sheet), 25.3K calculated
    Jandy Stealth JHPU 2.0 PUMP, 2HP
    Jandy CL340 cartridge filter
    Pentair C320 inline chlorinator
    AquaComfort heatpump heater

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