|
The point of the drop checker is to remove the variables of aquarium water. While your tank water may be 5 dKH, what if there are other variables that throw off the pH/KH relationship? Further what if something happens that slowly changes your pH/KH other than the CO2 injection that you don't notice? Further many people don't have water with dKH within the range that allows green to be an indication of 30ppm of CO2. With a KH of 5 dKH your indicator is actually showing higher than 30ppm CO2 when it turns green. While it's still a good number and not so high as to cause problems, it isn't 30ppm. By using the reference solution you remove these variables.
|