AE Design 4 dKH Solution - 250ml

Would highly recommend this to everyone. No more guessing game on CO2 in the tank. Just add a few ml in your drop checker and a couple of drops of BLUE ph test kit reagent. Pop into tank accurate results in hour or two. Brilliant product. The economy side 250ml give around 80 test (3 ml each time in drop checker) that works out around 10 pence per test.