I tried the autotopoff.com and got a faulty float, so this is what I did.

Water from the wall (saddle tap into the incoming line on the other side of the wall)...



...feeding my RODI, waste water is right behind the wall into the bathtub drain...



... RODI running up across the closet wall and into the 20 gallon tote container...





...inside container, you can see the many ports...



... and the outside of the conainer. To the right is a five gallon container for kalkwasser.
The bottom hose is the direct feed to the float. I have a shut off valve so that I can perform a water change without worrying that I'm filling the tank as I'm draining it.

I forgot to think of equal pressure and what not, because that next line that feeds the bucket about four inches higher is the original intent to fill the kalk bucket. I plan on putting in another shutoff valve to the left of the bottom tee and limit the top off to whatever flows through the kalk bucket.

The two ports higher on the container is an overflow that spills directly into the 32 gallon mixing station. I put one slightly higher than the other as a backup in case the single line wasn't capable of handling the RODI flow rate. Turns out that it can, but the solace it provides...





and the line that feeds into the sump to the mechanical float. My next great project is to tie the line down so that it doesn't look like a russian nuclear facility.