Anything over 300 and you are pushing it. I had pretty bad lock out this cycle and it the metals\chemmies in the water did not help at all.
razzapiggy Reviewed by razzapiggy on . Reverse Osmosis vs. Inline Filter Discussion So my current tap water is coming out at about 300PPM - way too freaking high. I am making plans to either get a r\o for the next cycle, or hook up several inline filters to a single hose coming from the water that's being pulled out of the sink. I really don't like that r\o's waste three gallons for a single gallon of purified water, but I'm not sure how good the inline filter will work. Do any of you use inline filters? How well does it work? I've read alot of the chemicals in our Rating: 5