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Thread: DPD powder R-0870

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    Illupo's Avatar
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    DPD powder R-0870

    Just opened my replacement jar of DPD powder and it is stupid question time again. The jar I just ran out of came with my TF100 kit a year ago February. The powder was ash gray. The new one is as white as the snow. Huh? Hard to believe the same chemical is two different colors. Have not tried the new one to see if it works any differently, but was wondering if there is (or was) something wrong with one of the powders? If I need to get a replacement, now is the time.
    Inground 1800 gallon gunite spa/pool, installed mid 1980s.
    Pentair Clean and Clear Plus 4 cartridge filter Model CCP 240
    Pac Fab Challenger (High head, High flow) 1 1/2 HP pump
    One Jandy valve controlling automatic chlorinator

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    JoyfulNoise's Avatar
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    Re: DPD powder R-0870

    Normally the DPD powder is white. As it ages and is exposed to heat and humidity, it can take on a grayish color. It does not affect the readings. If the powder gets purplish-black, that is an indication of extreme moisture exposure and the powder is likely no longer good.

    The test kit chemicals really need to be stored indoors in a cool and dry space. They should only be taken out for testing and then returned indoors. Heat and humidity exposure can easily degrade them.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Illupo's Avatar
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    Re: DPD powder R-0870

    That is interesting! I have always kept my kit inside a cool, dark closet in the house. The gray one that came with the kit then a year ago must have been somehow exposed.
    Inground 1800 gallon gunite spa/pool, installed mid 1980s.
    Pentair Clean and Clear Plus 4 cartridge filter Model CCP 240
    Pac Fab Challenger (High head, High flow) 1 1/2 HP pump
    One Jandy valve controlling automatic chlorinator

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    JoyfulNoise's Avatar
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    Re: DPD powder R-0870

    Quote Originally Posted by Illupo View Post
    That is interesting! I have always kept my kit inside a cool, dark closet in the house. The gray one that came with the kit then a year ago must have been somehow exposed.
    It can happen during shipping. Since you're up in Scottsdale, I would suggest you only order reagents in the early Spring or late fall when the temperatures are cool. A box with test chemicals in them sitting out in a hot mailbox can easily go bad.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: DPD powder R-0870

    I just got a new one as well. The old one was purple/black but I have been using it to test. Should I assume that the readings were not accurate? Seemed to clear the pool at those levels!
    Vinyl IG 18x43 25,000 gallon
    Hayward Pro s244T 300 lb Sand (with occasional addition of clarifier)
    1.5 HP pump; Polaris 380 with booster pump; Hayward H400 gas heater
    TF-100 with SpeedSTIR

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    Re: DPD powder R-0870

    I am a new pool owner and ordered my TF-100 kit not long ago and have been using it since pool was installed late March. My powder came in grey - thought it was normal. I keep the test kit in the house in a closet. The powder has never gone outside since I got it. I also have a small bag of silica gel in there with it.
    24' x 52" 13.5K gal. Doughboy Autumn Breeze AG pool. Pentair CC200 Cartridge Filter. Pentair Dynamo 1HP 2 speed pump. Dolphin E-10 robot. TF-100 Test Kit. Confer CCX-AG with curve add on pool steps. My Pool Build.

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    JoyfulNoise's Avatar
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    Re: DPD powder R-0870

    Quote Originally Posted by Eilum View Post
    I just got a new one as well. The old one was purple/black but I have been using it to test. Should I assume that the readings were not accurate? Seemed to clear the pool at those levels!
    Quote Originally Posted by smankins View Post
    I am a new pool owner and ordered my TF-100 kit not long ago and have been using it since pool was installed late March. My powder came in grey - thought it was normal. I keep the test kit in the house in a closet. The powder has never gone outside since I got it. I also have a small bag of silica gel in there with it.
    White or grey is fine. Even when it starts to turn black, it will still work. The problem with humidity is that it makes the powder clump together and form hardened and caked up chunks. As long as you keep it indoors and out of the heat and humidity, it will be fine. The Taylor R-0870 DPD powder bottle actually has a desiccant built into the wall of the bottle. It's a very special type of packaging for moisture sensitive powders but it also means that the cost of that bottle is more expensive than other sources. Even with that built in desiccant, I have received R-0870 containers where the powder was a little off-white/grey.

    It will work for you so I would just continue with what your are doing.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: DPD powder R-0870

    Thanks for the info. I didn't know that about the little powder jar. I can remove my little desiccant bag and make it easier to get the powder out.
    24' x 52" 13.5K gal. Doughboy Autumn Breeze AG pool. Pentair CC200 Cartridge Filter. Pentair Dynamo 1HP 2 speed pump. Dolphin E-10 robot. TF-100 Test Kit. Confer CCX-AG with curve add on pool steps. My Pool Build.

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