Yes, dilution was a major problem. I was calculating mix and dilutions, and if I wanted to use the amount mixed up on several zones, was not confisent the last zone was receiving the same dilution as the first. BTW, there was always some faint dye left after running it. When is it empty? The flow control is a not very specific.
I have a Dosematic, and am happy with it. I think any of the types are adequate.
AVB is great.
Jeff