pH Monitor and Controller

[chem geek]

I'm not fond of ORP and see it, at best, as a process control system for chlorine that requires manual setpoint setting and can be flaky. As for ORP correlation with active chlorine levels in real pools, there are graphs showing this in this post.

[PoolDoc]

Very interesting graph, Richard.

Uh, maybe I should say, very interesting graph to me . . . and maybe 4 other people in the universe ! I've got questions, but they are China Shop questions, so I'll hold off.

Ben
"PoolDoc"