KH4 solution confusion
I thought buying distilled water to make a KH4 solution meant the distilled water would be soft and you would add baking soda to achieve 4KH. I tested the distilled water straight from the bottle which gave me a blue reading(start point on the Red Sea KH test kit). I have to add like 18 drops to reach the end result color.This would indicate very hard water according to directions. My tank water starts out a amber color which only requires a few drops to achieve end point. What am I missing here?