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Chlorine and chloramine 

Chlorine is added to tap water to make it safe for human consumption, however it is highly toxic to aquatic life. Chlorine in tap water destroys bacteria and as your filtration system relies on it's bacteria colonies to deal with ammonia and nitrites it is essential that no chlorine comes into contact with it. Chlorine is easily removed from the tap water either by standing, aeration or by adding a water conditioner.

Chlorine is also seen in the form of chloramine. Chloramines are a combination of chlorine and a small amount of ammonia, which will release chlorine over time. You may have removed chlorine from your aquarium water by letting the water sit for a few days before using it. This will not work with chloramines because they persist much longer than chlorine and may take weeks to disappear. The only sure way to remove chloramine is by using a water conditioner that specifically states it removes both chlorine AND chloramine.

Back to water chemistry or on to General hardness (gH) and carbonate hardness (kH)

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