shock level with solid cover when closing?

[rajung]

Thanks, So I assume what I will do is ok, I haven't done all this yet, will do in a few days.
As far as shock, with a solid cover,should I elevate the FC to normal shock level or reduced?thanks

[BigDave]

I bring to shock level as per the Best Guess Chart when I close.

[JimK]

I bring to shock level as per the Best Guess Chart when I close.

I think one of the OP's concerns is whether or not covering the pool with a solid cover after shocking will cause issues with the pool out gassing.

After shocking, do you wait a bit before covering so byproducts have a chance to properly out gas? Or do you cover right away after shocking?

[rajung]

That is correct,I do think I will shock to the 20ppm, then wait a few days for it to drop back to the 5.0ppm for my stabilizer level which is at 40ppm.
Sound right?

[FormerBromineUser]

Just an aside.... Are you also worried about high CL affecting your cover? Also, do you have a pump on your cover over the winter?

[rajung]

I take all my equipment to the garage,except heater which I cover.
More worried about the high chlorine level on the vinyl liner than the cover.
I think I am going to go to the shock level 20,and wait couple days,check FC and when it gets down to 5 ppm I will cover.My CYA is currently at 40ppm.

[CarlD]

The Best Guess table says your shock level, with a CYA of 40, is 15ppm, not 20.

I would suggest, if you are uncomfortable closing the cover with the FC at 15, that you wait until the water temp is around 60deg or lower, and then let the FC drop before you cover. Algae doesn't grow much in cold water.

Beyond that, I always use a mesh cover. Not this year, as I'm rebuilding the pool and there's no water in it. Also no liner and no walls!