Each ESV B-Ionic Calcium Buffer System has two components - Alkalinity and Calcium. When used in equal parts, easily maintain calcium and alkalinity levels with no mixing of powders, disruption of ionic balance or addition of organic chemicals. Formulated to provide all the proper ratios to duplicate the composition of synthetic seawater. With use, can help restore ions lost from protein skimming and help maintain the ionic balance of the aquarium water. The recommended starting dose is 1mL of each component per 4 gallons of aquarium capacity per day. Test calcium and alkalinity regularly until the correct dosing amount is achieved and to keep both elements stable from day to day. Each tank is different and depends on many different variables will determine how much your tank will need to be dosed on a daily basis.