Quote Originally Posted by xoroniox
I believe it is the UV rays from the sun that degrades the CL therefore if i am correct it wont matter if it is sunny or cloudy UV rays go through clouds. I totally agree if your pool needs CL do not wait, however if you have a low CL level i would wait until dark, i always do. i hope i am correct here, lol ... goodluck
That sounds right, but does anybody know for sure?

Now that my pool is open and stable, I can find an evening to do it. It's just that spring start-up when the pool is like a green baby, needing constant attention till it turns blue.