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Old 03-02-2015, 07:22 PM   #1
City: Cataumet, MA
Country: US
Join Date: Mar 2015
Posts: 1
Vented loop or check valve for toilet discharge line

My aft head back-fills when the holding tank is full and the sea is rough. The current line from toilet to holding tank is straight. Holding tank is slightly higher than the toilet bowl (a retrograde installation). System can not discharge overboard. Why wouldn't just a check valve on the line near the holding tank prevent backwash rather than the more difficult task of putting in a vented loop?
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