Neptune has decent instructions if you Google the afs manual. Not intending to be rude just that you might see something else in there as far as programming. You will need to add a virtual outlet which you could call auto feed or something. You would program the virtual outlet with set off fallback off and if afs = on then on Then you would need to add a line in your return pump advanced program for if auto feed = on then off as well as a defer to keep the pump off for awhile while the food floats around like defer 000:05 then off which gives you five minutes. I’d copy and paste samples but it’s not easy for me but this should point you in the right direction good luck and enjoy