Thanks for the information. Well, my set up is in a bedroom... directly next to a bathroom which I assume would be where we would use a reverse osmosis machine. The bedroom I grow herb in also shares a wall with garage, but I think it makes more sense to just run the r\o in the bathroom... and put the waste right into the shower drain.

I don't have a ton of room to put the r\o in my grow room, and it would create alot more work because I'd need to lug the waste water out of the room. It seems easier to attach a hose for purified water and run it about 12-15 feet into my resi, and then put the waste water directly down the shower drain.

I'm not sure I want the waste water from a r\o machine coming out of my other faucets, just seems a little weird to me quite honestly.

So an inline filter will get some chemicals out it seems, but won't lower my PPM... is that what you are saying? Not familiar with the term TDS. Thanks again for the help!