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Just been looking at JamesC's remineralising recipe on his site - http://theplantedtank.co.uk/RO.htm A few questions about it if anyone's able to help - 1. presumably when magnesium and calcium sulphate is sold it is usually in the heptahydrate and dihydrate forms? 2. why add chloride, why...

sounds good to me. if NH3 ammonia is oxidised to NO3 nitrate, then 3 H+ ions are potentially produced, which shift the equilibrium in the CO2 + H20 <=> H2CO3 <=> H+ + HCO3- equation towards the left and thus lower the dKH. so answering my original question, dkH drops with time in a closed...

thanks for the replies, so in the end vallis lowers both the kh and gh by removing calcium carbonate/bicarbonate from the water! thanks though for clarifying my original post which was not entirely clear. had the gh of the water to hand, but not the kh, which was why it ended up getting...

looking on the tropica website: www.tropica.com/article_fullscreen.asp?type=news&id=683 it shows a graph at the bottom of the page showing that in a planted tank dkH drops with time. why does this happen? my local water has a dGH of 15, does this mean i can expect that to fall with time in my...