Regarding chlorine, you need to use the Best Guess Chart, linked in my signature below. (Or if you prefer more decimals in your answers, you can use Richard's (Chem_Geek) more elaborate version on TFP.)

What make / model of SWCG do you have? That sounds awfully low. By chance, is it one that is supposed to be combined with some sort of copper ('mineral') product?

TA does not have to be that high, but again I'm curious about your unit.

Ben