[randpost]

Like Zapins said, It will last a 55 gallon a year at least. I have the same package with a pound of Iron thrown in. I calculated how long it would last on my 29 gallon given my dosage and its well over 2 years. I also add GH Booster and Baking soda since I use R/O water which needs to be remineralized.

converting measurements is and easy task with a calculator or Google.