What we do is, say that you have 100 gallon tank and you have 15% concentration and if you have 15 gallons of chemistry and 85 gallons of water if you add one more gallon of chemistry it will bring it up to about another percent concentration. Its not an exact way to do it, but there is a calculation that Wayne can send. But due to the pipes being full of fluid and the sprays coming on and the washer ending up at different levels of your run/fill switch, it’s basically approximates. Usually if it’s a 100-gallon tank, it’s going to change your concentration by percent.