RHF is the Randy Holmes Farley method. If I'm not mistaken he developed the home mix suppliments or at the very least he brought it to our attention. Here is a link to the instructions, it's what Ian linked you to and seeing as they sell the bulk ingredients you may as well buy it all from them. It took me a while to find the Ca and it was about $40 for a bag but one bag would make a lot of concentrate. I'd stick with Ian's stuff as it uses the improved recipe.
Doug
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