David,
I'd like to get some Cheato from you also if possible, especially since it's full of pods and other critters since I'm trying to get some pods back in my tank that seem to have disappeared for some reason over the years.
Charles
John at BRK had some DI resin on the shelf when I was out there last Friday. I seem to remember he had both the replacement cartridge and some bags of resin for refill.
You have the same overflow that I am running on my 75. I'm using a mag 9.5 for a return pump and it's doing fine once I adjusted the tubes in the drains to cut down on the flushing noises. Just make sure to use the aqualifter pump to keep the air out of the overflow chamber or it will get a air bubble and break siphon.
There was a thread on CMAS awhile back on this problem. Cause there was water being added to salt instead of the salt being added to the water. Don't know why it would make a difference but apparently it does with IO