"much_to_do" wrote in message
. ..
I know this has been discussed many times before on this NG but just
wondered if anyone had any personnel recommendations drawing from their
own
experience rather than anecdotal evidence.

I have an electronic box made by Aqua Dial. It is about 80% plus
successful. I also have a phosphor canister descaler. This is better. I
haven't put both together. but it would be a nice experiment.