Do Not Use a Drain Line Adapter or Check Valve For A Reverse Osmosis Filter System

Do not use a drain line adapter or check value for a reverse osmosis filter system. I did this for a few months and indirectly caused a health hazard because of dishwasher backflow. Propper locations for where to put the drain valve are linked - APEC Systems, General Electric

How this came come my radar: Will gravity be an issue for this dishwasher drain tube adapter? (connecting RO Water Filter Drainage to the garbage disposal / main drain) - Worried the dishwasher drain tube won’t drain all the way. : r/Plumbing