Fill bottle with Reverse osmosis water and shake, add RO water until level is up to the neck of the bottle. your product is ready to be use. Shake well before each use. For every 50 gallons of total aquarium volume, dose 1-4 capfuls (5-20mL) in an area with good and away from direct contact with corals. Keep bottle tightly closed when not in use.
This product will temporarily cloud aquarium water after dosing so it is recommended to dose ONE at night.
Proper dosing with One maintains: 400 ppm Ca, 7 dkh, 1300 ppm Mg