Effects of rain on pool chemistry?

[kelemvor]

I got 8 inches since last Thursday and it hasn't made a significant impact on chemistry that I've noticed. I'm on swcg, though. I was kind of wishing the "acid rain" would drive my pH down so I didn't have to go out in the rain today and pour acid in.

It's been so dry here this year that I've had to add water regularly due to splashout and evaporation. The overfilling of the pool by the rain is welcome here. I won't have to tell the kids to take it easy on cannonballs for a little while!

Edit: I just checked salt levels and they're down 200ppm. I'm guessing it's just because of all the extra water and the concentration will increase as water evaporates; although if it keeps raining I'll be loosing salt due to water overflowing and spilling out.