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Old 01-16-2018, 08:51 PM   #21
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I guess we do not understand what you are asking... What exactly are you looking for?



Is there a chemical answer to get rid of stink from a black water tank?
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Old 01-16-2018, 08:54 PM   #22
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Ok I have ordered 50kg of Sodium Percarbonate lets see how this goes
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Old 01-16-2018, 08:58 PM   #23
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Old 01-16-2018, 09:06 PM   #24
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1st I have read Peggys Bible
2nd I have tried Noliflex but the stink comes back $45 a bottle in Australia
3 I have flushed the 100liter tank and inspected there is no build up
4 Im in brackish water ?
5 I have fitted carbon filter
6 Is Sodium Percarbonate the answer
7 Im fed up
8 Should I change diet
I have a whole bunch of questions that need answers before I can offer any solutions, and I think it'll be easier to tackle this problem one-on-one. So how 'bout sending me a PM?

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Old 01-16-2018, 09:32 PM   #25
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NO

Y ?
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Old 01-17-2018, 07:40 AM   #26
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Some good ideas introducing oxygen is a winter project but Im still looking for a chemical answer to black water tank? ??????????

I think the answer is probably no. Hence the other suggestions.

You might be able to "perfume" the odor with chemicals; many don't think that's a real "solution."

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Old 01-17-2018, 09:57 AM   #27
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You could try rerouting your vent to the highest point on your boat. that would at least get the odor away from you.
The question is, where is the odor coming from? If it's from the vent (and the tank), moving the vent might work but on many boats it wouldn't be practical. If the odor is from the vent, it's because the tank stinks. There are ways to deal with that.

If the odor is in the head compartment (not the vent) and is mostly the first few flushes after the head has been unused for a while, the odor is being caused by organisms drawn in by the raw water for flushing. In between uses, they dry up, die and rot. When you first flush after disuse, they are washed out into the head and stink up the compartment.

A screen or filter on the flushing water may help but the best solution is a new head connected to the potable water system for flushing.

You need to determine where the problem is coming from before you set out to fix it.
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Old 01-17-2018, 12:59 PM   #28
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Have you cleaned your vent line by flushing it with water .
the waste might be in there . Noflex can't get to it
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Old 01-17-2018, 03:28 PM   #29
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It could also be the waste lines themselves. They will, over time, absorb odors and will need to be replaced. Even hoses rated for 'head' use, eventually will fail.
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Old 01-17-2018, 04:46 PM   #30
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Good thought but we near live on the flybridge so best keep the stink away from up there .And I dont think all the stink is from the breather

Not sure I understand. If the odor isn’t coming form the tank vent but you notice the odor in the boat, it could be your hoses are permeated and need to be replaced.
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Old 01-17-2018, 05:30 PM   #31
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Peggy has offered to help me (thanks Peggy ) I have very limited internet and no phone so I will need to contact Peggy when I get home .

Yesterday I checked all hoses no leaks no smell .When I flush the smell was worse but then settled down .
I added 1kg Napisan to 100liter tank 1/8 full (sodium percarbonate) and today no smell what so ever .This was a temporary measure till I talk it over with Peggy
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Old 01-17-2018, 11:27 PM   #32
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I would contact Marine Sanitation in Seattle Washington and chat with them, but they are a lot closer to me.
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Old 01-17-2018, 11:34 PM   #33
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I would contact Marine Sanitation in Seattle Washington and chat with them, but they are a lot closer to me.




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Old 01-17-2018, 11:47 PM   #34
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Some good ideas introducing oxygen is a winter project but Im still looking for a chemical answer to black water tank? ??????????

There is a chemical answer: freshwater. And you’ll probably have to change the lines as well.
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Old 01-18-2018, 12:47 AM   #35
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Even using freshwater and not enough oxygen the tank will stink. You can add chemicals, but the real solution is add air. We did the Groco Sweetank and never added any chemicals at all for 9 more years that we owned the boat without any stink.
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Old 01-18-2018, 12:55 AM   #36
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Even using freshwater and not enough oxygen the tank will stink. You can add chemicals, but the real solution is add air....
The real issue is fecal matter. Govts insist each boat become a sewage processor, something Govts have huge trouble managing, judging from the raw sewage pumped into bays and beaches here whenever it rains.
Gaston, I hope you find a solution. The kilo of Napisan you added should start the process nicely, meanwhile if we see you out we`ll anchor upwind.
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Old 01-18-2018, 01:11 AM   #37
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The real issue is fecal matter. Govts insist each boat become a sewage processor, something Govts have huge trouble managing, judging from the raw sewage pumped into bays and beaches here whenever it rains.
Gaston, I hope you find a solution. The kilo of Napisan you added should start the process nicely, meanwhile if we see you out we`ll anchor upwind.



Hi Bruce the Napisan is making the boat smell like a baby's bum only wish I did it 6 months ago
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Old 01-18-2018, 02:31 AM   #38
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Hi Bruce the Napisan is making the boat smell like a baby's bum only wish I did it 6 months ago
Gaston,

How often are you adding it - per tank full ie after each tank pump out or does it last a couple. I have exactly the same problem. Sitting in the cockpit after a flush sure stops any conversation.
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Old 01-18-2018, 03:04 AM   #39
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Gaston,

How often are you adding it - per tank full ie after each tank pump out or does it last a couple. I have exactly the same problem. Sitting in the cockpit after a flush sure stops any conversation.


I'd say there was 1/4 tank say 25liters that had been there for 2 weeks cooking 6 hours after dosing its sweet as roses .


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Old 01-18-2018, 03:10 AM   #40
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Gaston,

How often are you adding it - per tank full ie after each tank pump out or does it last a couple. I have exactly the same problem. Sitting in the cockpit after a flush sure stops any conversation.

The good thing is you realty do know your true friends
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