Thanks watermom! I knew I did not want cholorine to drop below a 3. It had been consistently around 5-6 with no problems until recently. I will admit I did not go out during the rain to test to water :-( I thought that testing it before and after the rain would be okay but now I know! I'm going to get some bleach at lunch today and hope that will get it back up and keep it up. Do I need to bring it to shock levels first and then let the FC slowly drop back down? Or do I just need to add enough bleach to reach a 3-5 FC level? Thank you!!