This RO unit was left under the kitchen sink by the previous owners, they even left a new sediment cartridge and 2 carbon block cartridges. The sink in my laundry room just happens to be right behind my main tank so I moved it and converted it to drip into my tank. I drilled my sump so I could drain the water right back to the sink. I removed the RO membrane so I am using the unit as a 3 stage filter. I didnt want it to drop the temp in my tank so I ran 50 ft of the cheap water line to the tank to give it more time to warm up, worked great.
I added my version of a "heat exchanger", its simple, cheap and effective.
The water from my sump overflows into a 3 gallon jug which then overflows into my sinks drain. The cold fresh water is filtered then flows through 100ft of water line that is submerged in the warm waste water therefore getting heated before making it to my tank.
2 x Eheim 2080
Eheim 2062
36w Jbl Uv
Eheim compact x 1102 5000 l/h Filter floss + Air difuser combo
Sicce voyager hp7 high flow 10500 l/h
Insta set everything.
Crystal clean water all time. Very expensive but worth money
My stand is concrete. So left side filtration and right side filtration.
Click on pic to make them biger.