Well, my octo 2 has been running for a month or so and really like it. The controller is sweet and you can see which mode it's running so you dont have to remember colors like my mp40. I can also adjust the angle by grabing the cord and tug this way or that a draw back for some may be the strong focused stream of water, I wish it was a wider pattern like the Wave Puck it replaced BTW that is dead after 6 months, although a good cleaning may bring life back, there was no error code so if I ever get extra time I'll look at it. The 4 has to be a flow monster and if my mp40 dies thats were i'll be. Never owned a Tunze DRS has them on clearance and if I was on a budget I would not hesitate. I cant wait to see what you come up with on this Dream Build
@siggy - I made a little progress yesterday and installed my new BRS 6 Stage RODI system with a booster pump and went with the 2nd membrane upgrade kit. Instead of 75 gallons a day I can produce 150 gallons a day if needed but the main purpose to add a 2nd membrane is to cut your waste water in half which only saves your filters from burning out so fast! If you own a RODI, system I would (HIGHLY recommended) getting the WATER SAVER UPGRADE KIT and installing the 2nd membrane and I will tell you why. If you have proper pressure (65+ PSI) highly recommend installing the kit, because it will produce water twice as fast as a standard 75 GPD or 100 GPD membrane while cutting the amount of wastewater in half. The BRS 150 GPD or 200 GPD Water Saver Upgrade Kit will increase the production of any 75 GPD RODI system to 150 GPD or 100 GPD RO membrane up to 200 GPD without having to use any additional water. With the installation of this kit water production will increase from approximately three gallons per hour to six gallons per hour! It does require 65psi or more into the first membrane in order to function properly and be efficient. If your home's water pressure is less then the recommended PSI do not worry, adding a booster pump just like what I had to do since my water pressure was under 50psi. so my Booster pump will kick on for a few minutes and then kick off ones the RODI has filled your storage container.
Here are a few pics from yesterday on my install for my Brand new RODI w/ booster pump included and a WATER SAVER UPGRADE KIT. Today, I will finish up all of the wire management and install 1'' grey wire ducts so you will not be able to see the pressure switch wires and other RO Lines running over over the place. I like it nice and clean. FYI- The Water Saving Upgrade Kits are probably our most recommended RODI upgrade.