I never realised just how much chlorine they put in Sydney water until last night. On the weekend I got a fish tank (a nice AR-620T from Strictly Aquariums) and I've been running water through the filters to get the bacteria thing happening. I noticed that the tank wasn't evaporating very much (the water level hadn't dropped at all since I filled it), so I opened the hood and poked my nose in to have a look. I was nearly overwhelmed with the chlorine fumes trapped between the water and the hood of the tank! It smelt like a heated indoor swimming pool. This is why fresh water fish tank owners need to "age" their water by letting it sit for a day or two in the air to let the chlorine dissipate out before adding it to the tank.
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