Let's say I add 5 to 10 gallons of RODI water to a water change?
What's the tank size? What's your tap KH? I have a pretty high KH of 7, and unless I have 50% RO and 50% tap I can't see my KH lower enough. That's why I just avoid using RO, too much work and no really big results (I tried to use RO for 3 months the last summer, then got back to regular tap)
Tank size 125, but might use it on the 75, I see that I can get RODI at Walmart Food store place $.38 cents a gallon so $3.80 for 10 gallons plus the bottle price of $6.00 so another $12.00 , so I won't have to hook up my RODI unit , as the wife does not want me too.:moody: