I run my tap water into the last bucket via garden hose,room temp water.Pump in my res goes to waste.I run until EC drops to close to tap.Water level doesn't change, water in equals water out.Takes about 20 minutes.
Not a big fan of these systems,seems your really only one step away from rdwc which is less complicated.What are the benefits of this system?Ive seen some monster grows but it does appear complicated with the extra pumps/timers.
It can be a challenge running a few separate dwc pails,ea one will be different.You try to find one mix that makes them all happy.
For those that are new try really low EC and see how it goes.Slowly add food and observe .I once grew a plant in just calmag and water,was only in veg but it did...
There small so no need for runoff,but do add more calmag.Just feed a circle around the plant every 3 days.In a week you'll have roots coming out the bottom.Then feed to runoff.