250ml Liquid Oxygen 

Liquid Oxygen contains hydrogen peroxide (H2O2) which is a highly unstable molecule. It will quickly break down in the nutrient tank releasing a free atom of oxygen. This oxygen atom is extremely reactive and will attach itself to either another atom, forming a stable oxygen molecule, or attack a nearby organic molecule, such as a virus or fungal spore. Liquid Oxygen can eliminate existing diseases and help to prevent future ones.