Ca/Alk/Mag Mess . . . How to fix?

[Enigma]

No worries about hijacking. It is all relevant.

I got a five gallon water change done today, and I've got another one prepped for tomorrow. The boys (hubby and #1 son) will be around tomorrow, so they can lug the water up the stairs for me. Trying to get the water upstairs is pure evil on my knees.

I'm just about to go test ca/Alk/mag.