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Thread: DPD Powder Question

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    DPD Powder Question

    After a few years of pool ownership, I just recently found this great website and have learned more in the past few days I did of reading than I have in the past 3 years trying to read other sites. What a great resource!

    After reading for not very long, I realized that if I really wanted to understand what was going on with my water, I needed a better test kit (had been using the basic Wally World OTO kit). I recently ordered and just received a Taylor K-2006 kit, and have a quick question about the DPD powder. I know from your great "pool school" page that one rounded dipper in 10ml is fine, and the measurement of the powder does not need to be precise. This is good, because the dpd "powder" that came in my kit seems a bit more granular than powder. Some grains definitely larger than others. Inevitably there seem to be at least a few grains that refuse to dissolve in the testing tube. Is this typical? Did I get a bad batch of "powder" or is this granular texture normal? If there are a few "slow to dissolve" grains in bottom of the tube, but the water is nice and pink, should I be concerned? Would it throw my test results off to have a few grains slowly dissolving while I perform the test?

    Thanks in advance!
    19,000 IG Vinyl, sand filter, liquid chlor, 1HP pump

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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: DPD Powder Question

    Normal. If you don't have a few undissolved granules, you aren't using enough powder.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    Re: DPD Powder Question

    Good deal. Thanks!
    19,000 IG Vinyl, sand filter, liquid chlor, 1HP pump

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    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: DPD Powder Question

    I confess to "grinding" my larger grains into powder.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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