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what chemical used for increasing hardness level?


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hey everyone, i am wondering if anyone knows the name of the chemical used to increase hardness levels in a fish tank?

i currently work cleaning pools and to increase the hardness level in a swimming pool you use hardness increaser aka calcium chloride.. just wondering if anyone has tried using this in a fish tank?

also, with adjusting ph's, alkalinity increaser aka sodiam bicarbonate, increases the ph, what chemical do you use to lower the ph?

as after doing a computerised water test on sydney's tap water, i found out that the current ph of such water is 8.2...

any info would be greatly appreciated



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