Ok, about those co2/kh/ph charts. Why is there more co2 at a higher KH? If my KH is 2 and I add more carbonates but not more co2 (to KH 5), how could there be more co2? Does this make sense? Thanks, Cavan (also got the spam David Grim talked about:( __________________________________________________ Do You Yahoo!? Yahoo! Tax Center - online filing with TurboTax http://taxes.yahoo.com/