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"Black" tank does not hold much and pressurizes

Discussion of AC's, plumbing and sanitation related issues.
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United States of America
Tennessee River Rat
Scurvy Dog
Scurvy Dog
Posts: 14
Joined: July 11th, 2016, 1:43 pm
Vessel Info: 2001 Carver 506 Aft Cabin 480 Volvo's
2007 Meridian 341 with 6.2 MPI Horizon Mercruiser Engines
1988 Sea Ray 340 with Twin 454's
1987 Stratos with 200 HP Merc
Location: Joe Wheeler Marina-Rogersville, AL
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Re: "Black" tank does not hold much and pressurizes

Postby Tennessee River Rat » June 27th, 2017, 3:34 pm

I had a similar problem with our last boat. We had overfilled our tank. It also had a charcoal filter on the vent line. Once your waste tank overfills the filter is toast. And it does pressurizes the system until you either replace or take filter off and connect some hose where filter was. Everything worked fine after that. But it will smell on the side where you vent exits. I started buying filters on amazon and much less $. I changed it out once a year and never had another problem.


United States of America
crquisto
CYO Supporter
CYO Supporter
Posts: 36
Joined: September 17th, 2014, 12:50 pm
Vessel Info: 2000 Carver 406 Aft Cabin, twin 7.4 gas Mercruisers - Flyboy II
Location: Possum Town, TN
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Re: "Black" tank does not hold much and pressurizes

Postby crquisto » June 29th, 2017, 9:30 pm

I have a 2000 406 with two holding tanks. Neither has a filter in the vent line and I don't think they ever had them. When I bought this boat, I soon found that every time I flushed either head we blew horrible odor out the vents. After searching this forum, I found Zaal No-Flex Digester to treat my systems. I didn't have a ton of sludge, but this product eliminated ALL odors after two treatments. I am not a Zaal salesman, but I will attest to its effectiveness.
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United States of America
g36
Captain
Captain
Posts: 250
Joined: April 7th, 2014, 6:07 pm
Vessel Info: 1997 Carver 405
Location: Soddy Daisy TN.
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Re: "Black" tank does not hold much and pressurizes

Postby g36 » June 29th, 2017, 10:56 pm

+1 on noflex been using this in my 405 for 4 years now
1997 Carver 405
Crusader xli
The Black Pearl
Soddy Daisy Tn.
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Topic author United States of America
CptBacardi
Scurvy Dog
Scurvy Dog
Posts: 10
Joined: June 11th, 2017, 5:02 pm
Vessel Info: 1989 Carver 38 Santego (not an aft cabin)
Location: Texas
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Re: "Black" tank does not hold much and pressurizes

Postby CptBacardi » July 12th, 2017, 1:54 pm

Ok I got in there and got it fixed! I removed the filter, cut the hose shorter and attached it directly to the through hull. The through hull was not clogged, but the 90 degree elbow at the tank was. A clothes hanger made quick work of that and I definitely knew when the clogged released because the holding tank relieved a bunch of pressure. Now the tank seems to fill and pump out correctly! Yea!

United States of America
crquisto
CYO Supporter
CYO Supporter
Posts: 36
Joined: September 17th, 2014, 12:50 pm
Vessel Info: 2000 Carver 406 Aft Cabin, twin 7.4 gas Mercruisers - Flyboy II
Location: Possum Town, TN
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Re: "Black" tank does not hold much and pressurizes

Postby crquisto » July 17th, 2017, 2:28 pm

You'll still need to address the odor overboard problem now that you have no vent filters. NoFlex Digester will do it.

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