Ocean Free Anti Chlorine Special is a newly developed German fish medicine used to improve the aquarium water quality by removing all the harmful gases from the water. It is economical, safe and non-toxic to aquarium, plants and fish even when used excessively. DOSAGE 1 capfull of medicine to about 16 gallons (60L) of water. Refer the following dosage for standard sized aquarium: (1) 2' tank, 1 cap-full medicine (2) 2.5' tank, 1.5 cap-full medicine (3) 3' tank, 2 cap-full medicine (4) 4' tank, 3.5' cap-full medicine