i started a stain treatment last sunday and everything was going good; i put in the polyquat 60 last sunday as well. i woke up last night to a bad rain storm. i just went to the pool (i was going to vacume it) and the water is a very blue cloudy color. i can barely see the bottom but it is visible. My pool has been clear all year. when i saw this i freaked out and ran inside. i can tell you my FC and CC are both 0.. and there were swimmers yesturday. i will post other chemical levels shortly.