Hi ya Maynard. I build my own dwc in 35liter bins with float valves in each , being supplied fresh water from a 250 liter drum . everything else is automated , temp via fans , lights obviously etc. I work away from home month on month off so dont get to look after ppm & ph as strictly as id like but still crank out some meke shit (kiwi for awesome ) & often well over a pound a plant. If you have the option to do a reticulated set up , id go for that , way easier to do ppm , nutes & ph in the one return/send reservoir than each bin individually ( hope ya doing more than one bro !!!). Also makes it easier for water changes . Shes all trial and error but my best advice with dwc is when adding nutes or ph adjuster , softly softly catch the monkey, ya can always dump the water and start again but that costs money , so less is best even if it takes a day or three to achieve your levels .