Had my new house/pool for 5-6 weeks now and finally got a decent rain. About 3" rain was added to the pool (just removed). Should the CL drop from 5.5 to 2.0 overnight? Little to no CC, CYA is about 45. pH was about 7.8, I just brought to down to 7.6. Added 80 oz bleach, CL back to 5.0 (how long after adding CL should you test?, I waited about 20 minutes). Will test again tonight when I get home.