I picked up two bags of fluorite for my 25G. The instructions on the bag say
rinse before use to wash off the dust. Well I rinsed for over an hour in a
22L bucket and the water is still brown.

It seems that warm/hot water get dirtier than cold(er) water. Am I simply
washing off the fines, or am I forcing some of the active ingredients into
solution? The bag says the material is chemically inactive.

Thanks