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Thread: Shelf life of regents

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    Shelf life of regents

    I have had my TF100 kit for a couple of years now. Many of the regents have been replaced. I am curious to know if there is a shelf life on the regents after which time they must be replaced to remain accurate?

    Thanks,
    Rich
    18x36 IG 26,000 gal, Vinyl Liner, 24" Sand filter Hayward S224T, Jandy AE3000 heatpump and 1.5 HP SuperPump. Circupool RJ45 SWG

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    Re: Shelf life of regents

    If kept in a cool dry place out of the sun the average life of most reagents is one year

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    JasonLion's Avatar
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    Re: Shelf life of regents

    If carefully stored they can last several years. If left out in direct sunlight some of them can go bad in a few weeks. Taylor says a year, many people here routinely get two years or more. However, the longer you try to go the more likely you are to run into problems.

    Some of the reagents are much more sensitive than others. The FAS-DPD titrant and the dyes used in the OTO, PH, TA, and CH tests are the most sensitive. Several of the others can last a really long time as long as they are properly closed and kept in the dark at cool but not freezing temperatures.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Shelf life of regents

    Jason is just KILLIN' my refill sales but his words are quite true. I had some DPD powder that had turned charcoal and was four years old but it still worked. I had some new powder to check behind it but it worked fine.

    I left my K-1000 (Thats the OTO chlorine test and the pH test together) out in the sun for a couple of days and it was TOAST.

    Again, Taylor says one year but, if you store it properly, you can get more.

    At some point, (maybe 2 years?) it is probably cost effective to replace everything at once and save on both reagent cost and shipping.

    I always test indoors and keep the kit in a cool, dry closet when not in use...next to the GOOD bourbon (when not in use)
    Dave S.
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    Re: Shelf life of regents

    Quote Originally Posted by JasonLion
    The FAS-DPD titrant and the dyes used in the OTO, PH, TA, and CH tests are the most sensitive.
    I recently noticed that my CH indicator was really thick and caused clumps in the vial. At first I thought it was magnesium but then I used a backup kit and it turned out that the reagent must have been bad. But that had to be over three years old as far as I can remember. The TA is that old too but seems to match the results of the newer reagents. I don't go through TA and CH reagents very fast but the other stuff is not around long enough to worry about.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Shelf life of regents

    Quote Originally Posted by JasonLion
    If carefully stored they can last several years. If left out in direct sunlight some of them can go bad in a few weeks. Taylor says a year, many people here routinely get two years or more. However, the longer you try to go the more likely you are to run into problems.

    Some of the reagents are much more sensitive than others. The FAS-DPD titrant and the dyes used in the OTO, PH, TA, and CH tests are the most sensitive. Several of the others can last a really long time as long as they are properly closed and kept in the dark at cool but not freezing temperatures.

    What are the signs that the Reagents are too old? Will it stop working completely or will it give inaccurate results.
    13k gallon IG gunite pool
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    JasonLion's Avatar
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    Re: Shelf life of regents

    It can be either way. As they start to go bad the results are off, and then when they go completely bad the results are clearly impossible.

    One clear sign that the dyes have gone bad is when they stain the plastic bottle they are in. Unfortunately they start to go bad before staining becomes completely obvious. For R-0871, the drops should be clear. If they are yellow it has gone bad.
    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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    Re: Shelf life of regents

    I'm reading here they can last anywhere from 1 to 3 or 4 years (if stored properly). That is good news! I would hate to throw away a bottle that is still 3/4 or more full just because it is a year old!

    Here is a follow up question...if they are ready to go, how do you dispose of them (especially if there is any liquid left in them)? Pour them down the drain? Chuck 'em into the garbage? These don't like responsible options to me. Luckily for me there is a hazardous waste collection day at the local landfill in a couple of weeks (No, the stuff doesn't go into the landfill! ).

    Mike
    *
    agp, 14.5 x 23 (yes, its a custom size, but it was free and came with a deck. Well, I had to go and get it...)

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    Mod Squad Bama Rambler's Avatar
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    Re: Shelf life of regents

    There have been several discussions about disposal, and given the chemicals and the quantities involved, it's not too bad to pour them down the drain. However, taking them for proper disposal is always a better idea, and I whole-heartedly encourage that.
    Dave J. TFP Moderator
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    Re: Shelf life of regents

    Quote Originally Posted by duraleigh
    At some point, (maybe 2 years?) it is probably cost effective to replace everything at once and save on both reagent cost and shipping.
    It is cheaper to replace all the chemicals at once. I store them in a kitchen cabinet and test indoors so I still use some of the older left over chemicals from last year.
    IG pebbletec pool: size of pool: 27,000 gal; filter: cartridge - Hayward Superstar Clear; pump size: 1.5 HP; TF 100 Test kit - got it on 7-29-10; The Pool Cleaner-4-wheel suction model; Pool calculator: http://www.poolcalculator.com/; bleach calc: http://troublefreepool.com/files/BleachCalc262.exe

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    Re: Shelf life of regents

    In trying to test Chlorine, no amount of drops will turn the water from pink to clear. Does the R-0870 also eventually expire?

    Thanks
    15k gallons / IG / PebbleSheen / Cartridge Filter / 1.5HP dual speed pump / Built Aug 2010 / Spa / TigerShark cleaner

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    Re: Shelf life of regents

    What's the best temperature to store regents?

    I have these temperatures in my house:

    basement 62-65 in the summer
    one room upstairs 55-60 in the winter
    first floor 67-72 all year round

    I don't mind storing them anywhere as I keep my liquid chlorine in the basement anyway and for the winter I can move them upstairs to coldest room in the house if that will extend regents life.

    Thanks
    23k in-ground plaster. Cartridge filter Hayward 450 or 550. Hayward 2ph pump.
    liquid chlorine, tablets occasionally when out of liquid and cya allows it. ph down.
    stabilizer (Had no cya last two openings, but never before that)
    no other chemicals used in years
    TF100.

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    Re: Shelf life of regents

    Bump for my question couple days ago.
    15k gallons / IG / PebbleSheen / Cartridge Filter / 1.5HP dual speed pump / Built Aug 2010 / Spa / TigerShark cleaner

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    Mod Squad pooldv's Avatar
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    Re: Shelf life of regents

    We recommend starting your own new thread to ask your questions rather than hijacking another member's thread or bumping up an old thread. It is often confusing trying to answer multiple members questions in the same thread and is not fair to the OP. Also, people often do not read old threads or assume that you are asking your question to the OP., who may or may not still be active on the forum.
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