Where should the reject output water go?
Reject output should be routed overboard, via the simplest means possible. If teeing into another overboard line, be sure the line can handle the additional volume of water being rejected by the unit per hour. Those figures are: 12 gallons for the 40E, 30 gallons for the 80E, and 60 gallons for the 160E every hour, plus the output of the other equipment feeding into this line. It’s important not to restrict the flow of your reject output.