Very nice. I'm limited by ceiling height and floor space, but I'd love to stack the tanks like that. I use two of the Rubbermaid trash cans instead. Very clean, though, good build.
Sorry it took so long to reply . I have finished plumbing top Rt 65 gal RO tank that is gravity feed to bottom Rt 65 gal salt mixing tank.The mixing tank has a mag 18 in it W/a Y barb one side gos to the ball valve on top front of tank for mixing & the other side gos to ball valve on left side of mixing container to the display. To the left of the mixing container is a 25 gal ATO tank W a mag 3 & is controled by RKL & Avast Ato. I also plumbed a SSA Aquitics large double reactor. Then there is my Diy skimmate bucket also controled by RKL & Avast Ato to shut off skimmer if it gets full. Still have to figure out how I want to drain display for water changes still using Brute can . I am going to MAX tommorow & I want to get another PC4 to get rid of some of the bulkey timers & power strips on the wall.