@scott11106 as I'm going to get Neptune Apex new generation complete package. I will get the FMM for all my flow sensors then. Couple questions.
1- does FMM come with corisponding cable to connect to Apex or is that separate?
2- Just cause you've done it already, what cable do I need to connect a second or third EB8 to Apex, if it doesn't directly reach (I'm assuming it wont because one of them will be in my QT side)
3-optical sensors themselves are directly wired to?
4-what pump did you use for salt storage to agitate the water?
5- what heaters are you using?
I dont not have a schematic for my plumbing layout. But it will be nearly exactly like yours, as I'm a plumber by trade and have done many thing that are similar to this, minis all apex stuff. Your layout for piping is perfectly drawn so it's literally what was already in my head as far as piping layout. Also small difference with mine will be the fact I'm not using check valves because my sump will have the volume to back siphon. Another small difference is my RODI storage tank will gravity feed down to a twenty gallon that will sit beside my sump. ATO will feed off of it, and for now I'll manually fill the twenty gallon up, just to get started. And if I end up automating it, it will be a double redundancy to prevent 55gallon of RODI water from hitting display.
Electrical I havnt thought to far ahead yet, other than sheeting my wall will apex will go, to help keep it clean and neat.
Also I just thought of this, do you have a updated schematic of your plumbing with the four DOS is the mix now, and all your current equipment?