I'm a newb to using Randy's 2-part but thought I should share my experience
I'm using less of the new stuff than the old Seachem and Brightwell's powders
I used to use 105+ ml/day of Alk/Ca and 60ishml of Mag
I'm now using (give or take) 70ml each of Alk/Ca and about 10ml of Mag
This 2-part stuff is potent and saving me big money annually
I've dropped my annual dosing costs from $140-50 to $30 or so
I've recently received numerous PMs asking where I buy my stuff, so here you go;
Epsom Salts 4Kg for $8 and Baking Soda 2Kg for $4 @ Walmart
Calcium Chloride (Dowflake Xtra) 20Kg for $26 @ Home Hardware
Magnesium Chloride Hexahydrate 10Kg for $39 from Canreef member TimT
TimT has other sizes and prices, so contact him for more buying options