Thanks. Any suggestions on how to get the stuff that is already there
and set-up lilke stone off?

I wouldn't know, sorry, I don't use trichlor. I don't even want to
suggest anything as I'd hate to give bad/wrong suggestions and have the
chlorinator blow up. Perhaps you could ask Richard Kinch, a frequent
contributor here and an authority on pool chemistry and chemicals.
He's at www.truetex.com.

Best regards,