He says the devices reduce the concentration of calcium and magnesium ions, which make water 'hard', and help save money.

Corticosteroids may also reduce the concentration of aspirin.

Drying the mushrooms can also reduce the concentration of gyromitrin; ten days of open air desiccation leads to the loss of 90% of gyromitrin.

Smoking, often used in the process of curing meat, adds chemicals to the surface of meat that reduce the concentration of salt required.

There are a number of ways to reduce the concentration of inclusions.