Hey Rumple,
so...
You fill the middle bucket up untill the water level stays at the desireable point in the sight indicator, (means that all the buckets are at that level) then as the plants suck up the solution you add just ph ballanced distilled water or do you add more nutrient solution?
depending on what u add back when u add back the total amount of your resevior you flush and change nutrient solution.
do i have this right???
also, could you possible go more into detail as to why you have tubing running from the top of your buckets and what your pond pump is doing. ive read the whole thread and i still do not understand this.... unless the pond pump and lid tubing are parts to a recirculating DWC then i do understand i believe that for right now i will not use this method (mostly just becuase i dont understand it well enough)
please and thankyou rumple