Bob Fenner told me there was no way to OD my 215 with a 300mg unit. But, there was no way I was going to tempt fate.

So I had mine hooked up to the Aquacontroller. Had it turn off if ORP got too high - but I don't think it ever turned off.

The dryers are a total pain in the tail. Get a BIG one, and lots of beads.