Thanks to the fish and plants in aquariums, they can often fall prey to cloudy, discoloured water and other nasties. API Crystal Size 5 and 6 are designed for use with a filtration system and remove organic aquarium pollutants, including colours, odours, heavy metals and toxic gases.
It is ideal for removing impurities that carbon alone cannot remove. It can help reduce the loss of fish when setting up your aquarium.
Please note that this product is for use with freshwater aquariums only.
Both crystal sizes are capable of treating up to 210 litres of water.