I have started up my pool for the spring. Opened to a green mess. After about 70 gals of bleach (30k gal + vinyl in ground), I have apparently held chlorine overnight. My question is I tested at zero cya at opening (I am sure it was eaten by bact.). Normally I keep at 50+ ppm due to living in the deep south. I have started adding cya with 2 socks with 3 lbs each at each skimmer entrance. My question is (finally I know) Is it ok to add bleach in the deep end with the cya at the sides? Oh yea ph is 8 to 8.5, alk. is 90. Thanks, been using the bbb method for 3 seasons and it was the best thing I have every done for my pool.