Re: Can you add 12.5% bleach directly int a Hayward chlorina
PJ is correct, mixing trichlor and bleach at full strength can result in an explosion, and will at a minimum produce dangerous fumes.
Besides adding bleach to a tablet feeder is a complete waste of time, as it will simply feed into the pool over the next several minutes. You might as well add bleach the way we recommend, by pouring slowly in front of a return jet while the pump is running.