2Hr Aquarist APT Pure

Industrial water chlorination dates back to the 1890s in Germany and the UK.

Today most urban tap water contains between 0.2ppm and 2ppm of Chlorine and Chloramines ( a more stable form of Chlorine).

This is high enough to kill water-borne diseases, but low enough for human consumption. However this level is sufficient to harm fish and destroy the beneficial bacteria in an aquarium.