Before covering my pool with a solid cover on 10/10/09, my tests were as follows:
I pulled back the cover to test the water today:
I was surprised that I still had FC. Is the drop in CH normal?
The CYA will go down a bit when I add more water when I open the pool.
Since the weather is getting warmer, I may have to add CL prior to opening the pool. Can I do this with the cover still on or do I have to open the pool at that point?