In an analysis of each type of hard water water in which each type will have different softener. If the water is very hard to use so much water that EDTA hard parts or EDTA is used less.
In the analysis of each type water softener The water each have different hardness. If the water is very hard to take much of EDTA is used less water with hardness less EDTA.
In the analysis of each kind of water hardness Water hardness, which each have different. If the water hardness is used EDTA much the water with low hardness is used EDTA less.