Red Sea Fish Pharm ARE21411 Reagent KH/Alkalinity Pro Kit Refill for Aquarium, 75 Tests

Red sea replaced the original color agent or whatever with this one which is a much clearer change. Much better choice than some of the cheaper alk test and I continue to get the refills. I only wish the refills were 10 bucks.

Never asked or this item

Exactly what i needed i love beeing able to buy refills for my test kits and the accuracy is great i switched to red sea from salifert after speeking with the rep at MAX a year ago and have been using there product every since

It’s confusing whenever you get to the changes f color. It says red but the reagent shows different color. I use Hanna checker now

It failed to provide an accurate reading on the second use do to being out of date