I would invite everybody to use the toilet etc. Then I would trigger an immediate regen by holding in the Extra Cycle button for five seconds. Sit with the unit, keep a log, look in the brine container to see the brine go down. The first step is the backwash, and you should see/hear water draining. The next step is brine draw. See how far down the brine falls.
Queueing a Regeneration
1. Press the Extra Cycle button. The service icon will flash to indicate that a regeneration is queued.
2. To cancel a queued regeneration, press the Extra Cycle button.
Press and hold the Extra Cycle button for five seconds.