Water Purification
I defer to Peggy on boat holding tanks, but.....many water purification tabs contain a form of chlorine that is used to kill harmfull bugs. All municipal wastewater treatment plants also used to use chlorine to kill bugs in the effluent before discharge to the receiving waters and many still do. The majority of community water supply systems also use chlorine for the same purpose.Sometimes an industrial chemical spill, like chlorine, will get into the sewers and reach a municipal wastewater treatment plant and then the normally healthy aerobic (aerobic means that there's lots of dissolved oxygen in the water to support healthy bug life) treatment process becomes quite upset as the "good" bugs die off in droves. It may even go anaerobic, that's when the smell really starts! So assuming that K.O. is some sort food to promote "good" bug life in the holding tank, then chlorine (in the high dosage) is theoretically likely to be counter-productive to using K.O.Having said all that, unless you are dosing your water with tabs to a level where it tastes totally disgusting, I would be very surprised if there is enough chlorine in your flush water to do any actual harm!