Not only is it unsafe to use cal hypo in a trichlor feeder, it's now unsafe to use trichlor in that feeder.

There are two problems:
  1. Any cal hypo residue left can react, possibly violently, with trichlor, if trichlor is added again.
  2. Cal hypo products lime dust, which is very likely to clog the trichlor feeder, and render it unable to operate properly or safely.
I'm locking this thread down, to prevent further discussion of how to misuse a trichlor feeder.

Ben
"PoolDoc"