Hey all, a quicky really.

For some time Ive been using RO bought (fairly cheaply, other than the fuel to go get it *UK fuel prices shudder*) on the assumption that my tap water is just too hard to use, therefore, Id just like to run it by you to check.

KH 9 degrees
GH 13.5 degrees

Before I wade in, no pun intended, and check what else is in it, just thought id ask you guys/gals. Its so hard it kills my kettle if i don't filter it!

One of the things Im not sure of is just how hard would it be to get any meaningful levels of CO2 into the water with a KH of that level, obviously I can select hard water plants that will handle it.

Thanks in advance