The online instructions, are a weekly feeding schedule. (FEED ONCE A WEEK)

Soluables can be used in MINIMAL ammounts as ammendments, (add to the feedings) but only if you are experienced enough to recognize plant issues as they are developing. (versus after the plant(s) have died) I have found the soluables unnecessary, but I use phosphoric acid (phDown) to lower water ph.

Using Cha Ching, I'd be overdosing my ladies with PO4. It's not that I'm against using the soluables, (I still use it once in a while...I've got half a jar left) It's that I'm not really one to over-complicate my garden. My results are stellar, and I find it difficult to see how or why I'd want to screw-up something that works great. The other two soluables I wouldn't use even if it was given to me. (they're unnecessary)