2 tsps. per gal is the saturation point, but what I am trying to express is that a lot of that is wasted because of mixing it, which causes it to react with the CO2 before it is in the tank. And, mixing the kalkwasser with the vinegar before adding the water frees the calcium and bicarbonate ions, thus you'll get a lot less calcium precipitation. We use kalkwasser because it has equal parts calcium and bicarbonate. If you're getting a lot of calcium precipitation because it is reacting with CO2 before it gets in your tank it can be detrimental because it will cause an imbalance. Yes, Randy Holmes Farley's article is very good; it was written over 10 years ago. Is it impossible that another scientist may be able to improve on this?