The carbondioxide tablet provide the CO2 to the aquarium aquatic plants for the growth. Using the new formula and technology, 100 % carbon dioxide tablet is free from toxin, pollutions and suspended substance. The tablet release carbon dioxide slowly into the water, supply water plant right amount of carbon dioxide and do not affect the fish absolutely. 36 tablets For every 40 liters of water use 2 tablets. Use 2 times a week Brand 100% SKU 100292053_NP-1020553068