I would skip the in-floor cleaner and any chemical automation.
I also would not put a WhisperFlo on a waterfall. WhispewrFlo pumps are designed for high pressure and would be inappropriate for a low pressure application such as a waterfall. The Intelliflo can easily handle the scuppers even at low rpm. How wide and how high will each scupper be? What is the design flow rate for the scuppers?
Is the main drain being tied into a skimmer? It should be run to the equipment pad.
What size pipe will be used for the skimmer lines?
Thanks for the info on the Whisperflo pumps.
In floor cleaning system seem to work really well here in the Southwest. Our main issue is dirt and dust. I can see where in other areas of the country with large deciduous trees, they may not be as effective. I am still deciding what scuppers to go with 2 24" and 1 36" smooth flow copper scuppers or CMP Natural Wonders Sheer Descent waterfalls (PVC product). Of course the copper scuppers are 4x the price but I like how the water flows out. The copper scuppers have a flow rate (designed) of 20-25 gpm.
The main drain will not be tied to skimmer. It will be plumbed to the equipment pad, since I will have infloor cleaning, the main drain (A&A AVSC) will flow to a very large leaf canister. 2.5" piping