Somewhere on the internet I converted 150 ppm (my water) to be 8.4 dhk? Would you go by this chart?
0 - 4 dH, 0 - 70 ppm : very soft
4 - 8 dH, 70 - 140 ppm : soft
8 - 12 dH, 140 - 210 ppm : medium hard
12 - 18 dH, 210 - 320 ppm : fairly hard
18 - 30 dH, 320 - 530 ppm : hard
I'm finding that on different websites, the water hardness scales vary?