Lets use the word volume.:smile:i think when it come to dosing a tank there two methods, the guesstimation method, where like Wes said u test before and after till the desired levels are met, and the exact gallonage method which testing would only be for confirming what u actually put in, because u already know the exact amount of water u actually have. simple analogy; one way is like cooking to taste (using a pinch of this or that) and the other is fallowing an exact recipe (one tea spoon of sugar, and a table spoon of salt), they both make food in the end.
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