I'll switch up on the chlorinators, and they are in fact on the return side.

On the skimmer, everywhere I read says pouring shock into skimmers is a nono, is this not true?

We took some water to the local pool supply shop for testing and they sent us home with $600 worth of Chems.

100# calcium
2 bottles of "phosfree" or something along that line
200# sodium bicarbonate
50# of stabilizer

Does this seem plausible? Or did we get oversold