there are two submerged pumps,there is not a holding bucket the netpot lids sit on the 5 gal grow bucket.there is only an inch or so of water in the grow bucket.
with the grow buckets and the nuit. storage tank at the same level, there has to be a repump bucket between the grow and storage.there has to be a high spot in the return line, higher than the feed ring in the grow buckets,this prevents a syphon

the feed ring in the top of the buckets have 4 spray emitters in them, which spray on the sides of the netpot
sounds complicated but not if you remember that liquids always seek there own level,which is why the need for a repump or the buckets would be flooded to the same level as the storage tank a40 gal panda
the pumps have been off for 36 hrs and things were still ok

hope this helps someone
Daddy