I know it's an old thread, but I actually have a summer's worth of experience with this. I have a 34x15 fiberglass pool with a Salt Water system that we keep at ~3300 ppm. My yard was trashed last year from the pool construction. I sodded it with Fescue. The pool has three sides that meet grass. Along those sides, it has grown in so thick that it practically chokes the mower if you don't keep up with it. The farther you get from pool edge, the patchier-is this a word??:-) - the grass gets. I have had the same experience with Hostas that are in the "splash zone". Just thought I'd chime in...back to lurk mode.