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Old 04-09-2016, 06:56 PM   #1
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City: Chesapeake Bay,Middle River,Md.
Country: USA
Vessel Name: Patty Ann
Vessel Model: Mainship 34 MK1 1980
Join Date: Jan 2014
Posts: 39
Two for 1 vent for holding tank..Thoughts?

A 25 gal holding tank with a 1/2 vent was added this winter has winter to our 1980 Mainship 34 MK1 . Would a "T" fitting placed in line on vent line connected to separate thru hull vents create more air flow? What do yah think? thanks David

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Old 04-09-2016, 07:14 PM   #2
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City: Au Gres
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 100
I don't think it will help much since you will not be enlarging the actual hose that goes into the tank. 1/2" vent is not large enough to get oxygen into the tank. It will allow pressure to equalize, but will not do much to aerate the tank so you do not get anerobic bacteria growing in the tank. The anerobic bacteria is the really smelly stuff. Ideally you should have 2 vents, one on each side of the tank going to both sides of the boat which will promote good flow through ventalation. That will keep smells down by promoting aerobic bacteria which does not smell. Another way to get oxygen into the tank is the Groco Sweetank system. It pumps air into the tank continously to keep anerobic bacteria at bay. I put one in a previous boat that would drive you off the dock every time the head was flushed due to the stinky air that was displaced from the holding tank. 2 hours after the Sweetank was installed the smell was completely gone and we never put chemicals in the tank again.
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