I Used Tech C/b For Years, And Got Good Results. Almost Better Results Than My Reactor I Use Now. My Feeling Is If You Use One Kent Product You Should Use Nothing But Kent Because I Don't Think They Mix As Well With Seachem.
If it was me, I would just use Baking Soda and CaCl2. Much cheaper and same active ingredients. Just my opinion though. Also if you are interested, I'm sure myself or someone else on the board could give you the recipe for a good homeade 2-part...again much cheaper. Also I would recomend Kalk unless you Ca demand is so high, you actually need a 2 part. That way you don't have to worry about balance as much...Collin