[tbittner]

I collect the ro/di water into 44g brute trash cans. They are rated safe for holding food (hdpe #2) so they don't leech chemicals into the water. Then I pump it into a different 44g brute trash can for mixing up the saltwater for water changes.

I think that most units use very similar filters so I'm not sure you would go wrong with any of them.

Yes, they typically have a piercing valve that pierces a small hole into an existing water line to feed it water. So if you have enough room, you can install them under a sink. If you have it push the ro/di water up into a container, it reduces the gpd. Not much, but it does take some of the water pressure away from producing water.