Originally Posted by VaughnH

I don't think a liquid pre-mix of a "GH booster" will work out well. It is hard to get calcium compounds to fully dissolve, even in the aquarium. Trying to get enough dissolved into 500 ml of water to be able to dose even 100 ml at a time would be difficult. The Epsom salts would dissolve ok, but calcium would be a problem.

I also find it hard to believe that buying calcium sulfate tablets at a drug store could ever be economical compared to buying plaster of paris, for example. I suspect just buying "Barr's GH Booster" would prove to be a lot cheaper. When I looked at this several years ago I was surprised to find that even epsom salts, at the drug store, would cost me more than MgSO4 from Greg Watson. So, if saving money is the reason for the DIY, be sure to actually check the costs first.