1. Your CYA is low, for use with an SWCG. Add some stabilizer . . . or use some dichlor. Sams Club has inexpensive undiluted dichlor: http://pool9.net/sams-dichlor24/

2. Only worry about calcium if it's too HIGH (> 300 ppm). You can ignore it. Only worry about TA if it's too high (>160 ppm) OR if you are having trouble with the pH level wandering all over the place.

3. Normally, with the FAS-DPD test, you shouldn't be concerned with a 1 drop CC reading (0.5 ppm with 10ml sample, 0.2 ppm with a 25 ml sample). If you continue to see a 0.5 ppm CC, you can run a test with a 25 ml sample, and see if it's just a '1 drop' error, or if you really do have 0.4 or 0.6 ppm CC.

Even then, on outdoor pools CC levels quickly disappear if you maintain chlorine levels -- and have some sunshine.