The starter kit comes with comes with 3 1 gallon jugs 2 pumps, a dosing cup, and 3 bags of each calc and alk, and 1 bag of mag. So you can make 3 gallons Cacl and alk, and 1 gal of mag. Then you can just order replacement stuff after that. Also in the starter kit all the stuff is pre measured. Just cut open the bag and mix it in the jug.