Hayward auto chlorinator, cal hypo pucks

Donldson

TFP Expert
LifeTime Supporter
Jun 12, 2009
4,390
NW Ohio
You cannot use cal-hypo in a device designed for trichlor. It is also unsafe to use cal-hypo in any container that has previously contained trichlor due to the potential reaction it could have with any trichlor residue.
(I know you said it is new, but that's an important point for anybody reading this thread in the future)