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Hard water


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I personally use rain water. My tanks are usually a mix of hard water and rain water to bring the PH and hardness down. 

Some folks have concerns about rain water, fears of acid rain, but rain water is naturally acidic (ph usually 5-6, mine is 5) and I drink rain water, its my only source of drinking water, so if its good enough for me its good enough for my aquarium.

There are other ways to do it I expect but since I have lots of free rain water I use that. Its also very handy for topping up evaporation - none of my tanks have lids.

Acidic rain water (or acidic natural waters) is not good for pipes, hence why all municipal councils bump up the pH above 7 for households. All my pipes are PVC plastic for that reason.

Edited by Water Box Dreams
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