Looks like it takes the Tap water and passes it through all the filters in the PAC then into the SAC. Next time I call Tech support I'll add that to my question. I know that box is heavy - got the best of me - had to find out why ? Also had a leak while initializing the PAC. Found out there is a sensor the box slides over - it has a green LED.Dried it and was OK. For sure it's a learning process huh?
I also had a leak in the control box. The waste line runs front to back - it has several connections much like all the others we use - anyway it was loose and allowed the fluid to leak into the Tub causing an alarm - BUT only after the weight of the SAC allowed the fluid to get under the SAC - talk about stink
I put a tuperware lid over the alarm after drying it somewhat - that allowed me to finish the treatment.
Don