Best thing since sliced bread!
Plumbed this into my existing drain pipe. I placed a 20 gallon under my 75g tank for water changes and top offs. I just check the tank underneath a few times a week and top it off as needed. It has made life MUCH easier!
I got this ATO for my Fluval Evo 13.5. Not realising that evaporation has a huge effect on the performance of my skimmer. Since adding the ATO my water level is constant and my skimmer is happy creating bubbles. It’s small and beet and very quiet. Top notch product !!!