You are taking a very big, and potentially serious risk by putting cal hypo in a trichlor feeder, unless it's the floating type. If it's the type that is plumbed into your system, I would remove the cal hypo, and do it now. The plumbed feeders are designed only for trichlor, and the heat and pressure that is generated when the pucks dissolve are not the same--possibly resulting in explosion and injury, since the cal hypo creates more heat. And no, the newer cal hypo pucks don't last like they say they do, even in the skimmer. Hth managed to find a way to screw up a perfectly good product by removing the plastic capsule that used to make the puck perform as advertised.

Janet