it takes a lot of practice By Ronald on 12/30/2016
Ronald wouldn't recommend this product to a friend
reagent D will crystalize if the temperature drops below about 65 degrees but will go back to solution if you gently warm it. do not look at the change in color using sunlight. use a white florescent light in a dark room and hold the vial close to the light as you drip the reagent. the color doesn't change much so what you are looking for is a change from purple to a milky looking blue. the key to the change is the milky blue.....
Can't detect color change By Jeffrey on 2/25/2016
Jeffrey wouldn't recommend this product to a friend
I purchased the Reef Colors Pro Multi Test. Good luck trying to notice the color change with the Potassium. Could have used the money on something else. Test is useless. I expect more from Red Sea.
Color change is EXTREMELY difficult to see By sjohnson2152 on 2/24/2016
sjohnson2152 wouldn't recommend this product to a friend
The color change isn't so much of an actual change in the color of the liquid like other tests where it goes from clearly blue to clearly red. Its so subtle that if you blink at the worng moment you will miss it becuase the before and after colors are so similiar. Its more like a "flash" of color when it changes. I'm getting better at noticing it after running the test a few times (its a long one so the learning curve takes some real patience) but like I said if you blink or lose focus at the wrong second you will miss the "change." A really bright light source helps a bit.
impossible to detect color By pras on 1/18/2016
pras wouldn't recommend this product to a friend
I am not color blind, infact i have a very good vision and i compliments about it. But this test is impossible to detect change in color during titration. If anyone wants my kit, take it.
Good product but hard to use By Jay on 2/4/2015
Jay wouldn't recommend this product to a friend
I also find it very difficult to detect the color change. I'm not sure when it's "blue enough". The color you see depends on the lighting where you do the test. Maybe I can take a picture of it and compare the colors in the image.
useless By jason on 1/11/2015
jason wouldn't recommend this product to a friend
Absolutely impossible for me to detect the titration color change.
Crystalized titrant By Deb on 12/7/2014
Deb wouldn't recommend this product to a friend
This is the second time Bottle D has crystalized and become unusable. My first test kit arrived crystalized and the second test kit crystalized after just 2 tests. I kept everything contaminant free. Will never purchase again.
Very accurate By Ali on 8/1/2011
Ali would recommend this product to a friend
it's not the easiest, and short BUT very accurate.
I checked with a lab standard solution.
and got +5 PPM.
Very Positive By radiata on 7/19/2011
radiata would recommend this product to a friend
Tried my test kit for the first time today, and I'm impressed. Considering I've found and used only one other potassium kit, this one is preferable - it is more granular (doesn't rely on a subjective visual measurement, best described as "cloudiness"). The titration procedure is quite different that any Salifert titration you might be used to, but I did it right the first time - READ THE INSTRUCTIONS in the kit carefully.
I will be certainly be buying the refills for this kit...