Technologies R-0870-I, DPD Powder Reagent, 10 gram | Dropper Refill Tests Bromine and Chlorine in Pools & Spas, Replace Annually

I use the K-2006 Taylor test kit. I have had excellent results using this test kit. If I take a sample to the pool store with their computer driven testing machine, the results of the tests will essentially be the same. I test once a day, so I go through about two containers of the powder per pool season. So, if the expiration date is 3-6 months out, that's fine. It will be gone by then. Why use two scoops? Because Taylor says that's what to use. Any water sample with free chlorine in it will turn pink with the first scoop. The test is based on using two scoops. Not 1 or 3. The reaction kinetics will be different depending on how much powder you put in. If you put in one scoop, the water will clear that much quicker when titrating. Fewer drops will mean lower level of FC. So, now you will be chlorinating your pool based on erroneous information. You have more chlorine than you think you have so you will be over-chlorinating if you go with the one scoop approach. Taylor is the industry gold standard for testing reagents and test procedures. Do what they say. I spend $500 to $800 a year of pool chemicals. The testing reagents are chump change in pool land. Follow Taylor's instructions. They know what they are doing. I have noticed the powder will turn gray as it gets older. It is taking on moisture and accuracy will suffer. Buy the 10gram container as you need it and use as fresh a test reagent as possible. Worry about how much you are spending on chlorine. Your time and energy is better spent there.

Along with the test solution, which I ordered separately, I can now measure chlorine and bromine more accurately and precisely than with the standard color matching Taylor test kit. Also quite easy to do.

DPD powder had an expiration date of more than a year! Thank you! For readers, DPD will go bad (turn blue/black) fairly quickly. To extend life, put the container in a jar or baggy (squeeze air out) with color changing silica gel dessicant beads, as the moisture is what causes the DPD to degrade. I put mine in a small mason jar with beads in the bottom, and vacuum seal (Foodsaver, etc.) it as well. Only takes a moment once a week when checking the chlorine level and substantially lengthens the life so you can use the whole container. When the gel beads turn color, just renew them in the oven (keep excess vacuumed in a jar).

Works as it should.

Bought May 2025 expires July 2027 so it is fresh. Works as described

just what you expect.

This is a must have item. Packaged well.

Very accurate results for FC. Would use again but probably smaller size.

One of the few places I can find replacements for my Taylor pool test kit - thanks!

Been using this product for a while and it works well, but this order shows up and the product expires in less than 6 months. Should give you at least a years use or more . No good .