Recirculation without the risk
Reusing drain water is the single largest water and fertiliser saving available to a substrate grower, and the single fastest way to distribute a root pathogen through an entire site. Treatment is not optional; it is the thing that makes the saving safe.
Dose against measured transmission
UV dose depends on how much light actually passes through the water, and drain water transmission changes with organic load. The disinfection unit measures transmission in line and modulates lamp output to hold the target dose, instead of assuming a clean-water figure that stops being true in week three of the crop.
Sized to the peak, not the average
Disinfection capacity is calculated against your peak irrigation hour on the longest day. A unit sized to daily average will silently bypass untreated water exactly when the crop is most vulnerable.