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Thread: Clumping on the R-0870 powder spoon

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    Clumping on the R-0870 powder spoon

    When I use the small DPD powder spoon (with reagent R-0870) it tends to clump on the tiny spoon. I can't imagine that this allows one to get a very accurate amount of the powder into your tube. Won't this affect the accuracy of your FC measurement?

    Am I the only one with this problem?

    Wouldn't it be better to have one double sized spoon rather than taking two spoonfuls each of which will be reduced due to the clumping as wouldn't the clumping be related to the surface area of the spoon which will be bigger in relation to the volume of powder in a small spoon rather than a bigger spoon.
    Vinyl 18'x36' in-ground 100,000 L, Jandy Aquapure 1400 SWCG, Jandy Lite2 heater, StaRite System3 filter, Evac tube solar heating panels

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    Mod Squad jblizzle's Avatar
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    Re: Clumping on the R-0870 powder spoon

    The amount does not matter. You can not use too much, but too little can cause problems. I never get clumping, is your spoon getting wet?

    Btw, one scoop should be plenty at normal FC levels and 10ml sample.
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    S1ngram's Avatar
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    Re: Clumping on the R-0870 powder spoon

    I think it's probably normal. It happens to me too. When it seems bad, I just clean it out with the corner of a napkin. I read that one poster uses the spoon to stir the solution after putting the powder in the tube.

    My spoon doesn't get wet, but humidity is high here. Maybe that's the reason.
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    Re: Clumping on the R-0870 powder spoon

    I don't intentionally wet it but it may pick up some moisture from humidity. My spoon has also turned partially black.

    Maybe that's a difference between AZ with low humidity and the NE/Southern Canada.

    - - - Updated - - -

    Quote Originally Posted by jblizzle View Post
    Btw, one scoop should be plenty at normal FC levels and 10ml sample.
    Good to know as I always follow the Taylor kit directions that mention two scoops - it doesn't differentiate between 10mL and 25mL samples. That is good to know to preserve my reagents.
    Vinyl 18'x36' in-ground 100,000 L, Jandy Aquapure 1400 SWCG, Jandy Lite2 heater, StaRite System3 filter, Evac tube solar heating panels

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    Re: Clumping on the R-0870 powder spoon

    Yes, it happens to me too. I just rinse the spoon in the solution in the tube once in a while & let it dry upside down on a paper towel. That way I'm sure I'm always getting enough powder
    Joanne 18' X 36' rectangular 26,700 gal. IG, vinyl, sand filter (300 lbs of sand) replaced last season, Hayward 1 hp pump & Hayward booster pump 3/4 hp, SWG: AquaRite Electronic Chlorine generator with TurboCell CLX-5 (replace 2 yrs. ago), approx. 7 yrs old, Polaris pool cleaner (old, on it's last leg! make that dead!!) TF-100 Test kit w/XL, Pool School!! And LOTS of it!!

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    Re: Clumping on the R-0870 powder spoon

    My spoon clumps with powder too but I'm used to after all these years and I scoop, dump and stir and throw it back in the box where it lives til the next time.
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    Re: Clumping on the R-0870 powder spoon

    I just shove the clumpy end back into the powder over and over until the clumps fall off. Its been humid and the powder started clumping too. This breaks up the clumps in the powder container too.
    13700 gal, 32'x16'x54" AG oval, vinyl, Echo Canyon II, 8500 series, Narrow Yard, Safety Fence & Stair, Sta-Rite Crystal Flow T-210WF, 44 GPM, Hayward SP1580TL 1HP Pump, Aqua Luminator, Festiva wedding cake steps, March 2006, TFT-100, Speed-Stir, Sample Sizer. Avatar Credit: TJ Townsend

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    Pflugerpool's Avatar
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    Re: Clumping on the R-0870 powder spoon

    Yep, I've noticed it too. It's irritating, but I've gotten used to taking a little piece of paper towel and wiping it off/out. On the Taylor kit, the DPD powder container has a slot in the lid that the scoop fits in to store it, and where the scoop contacts the container label it's turned that black too!

    The stuff seems pretty reactive, so it's probably good to mind your chemical hygiene and keep it off your skin whenever possible.
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    Re: Clumping on the R-0870 powder spoon

    Quote Originally Posted by wayner View Post
    I don't intentionally wet it but it may pick up some moisture from humidity. My spoon has also turned partially black.

    Maybe that's a difference between AZ with low humidity and the NE/Southern Canada.

    - - - Updated - - -

    Good to know as I always follow the Taylor kit directions that mention two scoops - it doesn't differentiate between 10mL and 25mL samples. That is good to know to preserve my reagents.
    I tried the 1 scoop I get a bad test results than with 2 scoops...maybe my 1 scoop wasn't enough even though it turned red...

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    Re: Clumping on the R-0870 powder spoon

    The powder is full of little white boulders down toward the bottom of the container.
    I usually have to throw out the last 1/4 of it.
    10,000 gal / Plaster / Cartridge Filter / 1 1/2 HP pump motor/ TF-100 test kit.

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    pwrstrk's Avatar
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    Re: Clumping on the R-0870 powder spoon

    The little white boulders can be crushed up. That's what I do with them. 😎
    Jeff
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    R.J.'s Avatar
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    Re: Clumping on the R-0870 powder spoon

    Just rinse it every time, no problems.
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    Mod Squad jblizzle's Avatar
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    Re: Clumping on the R-0870 powder spoon

    Yup, if it gets clumpy, just crush it back up.
    Jason, TFP Moderator
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    Re: Clumping on the R-0870 powder spoon

    does it matter that the powder becomes clumpy as far as it efficacy is concerned?

    would some type of desiccant help or even be necessary?
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    Mod Squad jblizzle's Avatar
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    Re: Clumping on the R-0870 powder spoon

    Does not matter. Just crush it back up.
    Jason, TFP Moderator
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