Hey RIU. So, I'm building a replica of a CCH2O UC8 DWC system. If you go to - http://cch2o.com/under-current-instructions/ - its basically everything you need right there to start building your own. Their standard 8 site system w/ 8 gallon square containers and 2x 5.5" net-pots is selling currently for $1377. This is what I'm going to be building and my total was about $500 before the chiller. Basically, all of the information in here can be found by digging through stickys and old forums.. but the write up sqydro did is older and the original pics no longer load so, being that I've done the homework and piecing together, I figured id share my experience. I would suggest anyone considering this build have basic understanding of how these systems work and some experience plumbing or making shit stop leaking. Lets start with the parts needed and what they'll cost you if you decide to pull the trigger on this BADASS little project.. Prices are what I paid - you can most likely find some things cheaper - I TRIED to source materials locally. The bulkheads and 8 gallon totes were ordered online everything else from local hardware stores or hydroponic shops. Pool/ pond supply stores may have things you need. If you live in a non-rec/med state where hydro shops may not be so popular, they have the pumps and related things.. - 8 gallon Sterilite black totes [email protected] for $40 I bought 2 6-packs so $80 - 2" slip x thread bulkhead fittings amazon $6.50/ea x17 ~$110 - 6" net pots $1/ea x16 $16 - 550gph active aqua inline water pump $38 - 70L/min active aqua air pump $53 - 3/4" RAINDRIP pipe thread inline "Y" filter $20 - 2"x10' piece of PVC pipe $8 - 3/4"x10' piece of PVC pipe $5 - 2" PVC fittings are $2-3/ea - four elbows - one 2" T - and one 2"x1/2 T about $15 altogether - various 1", 3/4" and 1/2" PVC fittings and ball valve ~$25 - Clear 3/8"x20' hose for air pump $10 - Clear 1/4"x25' hose $4 at Walmart same place for cheap good quality air stones @$3-4/ea - Black 3/4"x25' hose $23 - you'll want one big disk air diffuser for the epicenter bucket $23 Total at this point is around $500 and its expandable/upgradable. I think I'll be using a 19 gallon epicenter to expand system capacity in an attempt to not use a top-off res. If you wanted to use one as a top-off the way the UC8 is supposed to be set up you will need a float valve and whatever size bulkhead/uniseal you decide to use for the res itself. Some stuff you may want to make your life easier.. - PVC Glue ~$10 - thread tape/sealant - Silicone or similar elastic/water resistant sealant $5-10 - Float valve found in hydro stores usually with 3/8" thread for around $15 - 19 gallon sterilite tote $8 - Chiller. this is the one big item.. you'll probably need one. I paid $280 for a 1/10hp Active aqua unit I grew for years in DWC buckets in a basement with no chiller -water temps 60-75 and never any root rot. recent move has my grow space on the second floor and now temps are way up there as high as 85. plants seem fine but the need to chill water is what sold me on rDWC/UCDWC. I'll be setting up the epicenter and return tube. Also, determining bucket spacing and making the supply and return manifold - that will be the first "build" post.