when is it safe to swim after "shock"?

[aylad]

I'd swim in it at about 7 or 8, wearing an old suit.....or at about 4 or 5 wearing a new one....

Janet

[CarlD]

My answer? When it's back within the residual levels suggested in the BG table for that CYA level or below 10--whichever is higher.

So if my CYA is 40, I'll swim when the FC is 10 or less (resid is 3 to 6)

If my CYA is 150 I'll swim when the FC is up to 15 (Resid is 8 to 15).

You don't have to follow my advice--that's simply what I do.