Adams advocated mixing selenium toner in hypoclear. That's fine as long as you dispose of the entire bath after each session. However, selenium doesn't deplete very rapidly and can be reused - but only if it is NOT mixed with hypoclear. There are some minor environmental concerns with disposal of undepleted selenium toner, so the current preferred practice is to mix selenium toner with plain water only so that it can be saved for reuse.
I know and good point. I failed to mention that for the middle tray in step 5 I use selenium mixed in distilled water. I use HCA in trays 1 and 3.