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Old 07-08-2022, 15:17   #1
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Join Date: May 2022
Location: Heber Springs, Ar
Boat: 1980 Hunter Cherubini 33ft
Posts: 18
Black tank access

Is it a bad idea to cut an access hole in my black water tank? I'd like to get in there and muck it out. We just got the boat and the tank smells a bit and looks like it could use a scrubbing inside
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Old 07-08-2022, 16:41   #2
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Re: Black tank access

Are you for real? I hope this is just a case of mistyping. The black water tank holds human waste, it’s likely to have a bad smell and be a little dirty looking inside. Best thing is to be sure your vent tube is of adequate size and clear for optimum air circulation, that’ll help with the smell. Leave the scrubbing for the deck!
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Old 07-08-2022, 16:59   #3
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Location: Sydney Australia
Boat: Fisher pilothouse sloop 32'
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Re: Black tank access

Wot he said and I would add, half fill the tank with water and detergent, go for a spirited sail and return and pump it out, should perform all the cleaning required.
Rob aka Uncle Bob Sydney Australia.

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Old 07-08-2022, 19:05   #4
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Posts: 3,018
Re: Black tank access

You can install an inspection port that has a threaded cap...They're available in several sizes 3" - 6" This was the first one to come up in a google search , posted only to show you what inspection ports look like. I'm sure they're also available in OZ.

Sodium percarbonate does an excellent job of dissolving sludge (muck). A strong solution of detergent and water is what I'd use to clean the tank walls.

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Old 13-08-2022, 06:41   #5
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Join Date: Feb 2011
Location: France, britanny
Boat: twinkeels, 9m
Posts: 408
Re: Black tank access

ANY tank (water, diesel, blak/grey waters) should have an inspection hatch.

and check that you have an anti-odor carbon filter (limited lifespan) ...

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Old 13-08-2022, 07:20   #6
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Location: Lefkas Marina ,Greece
Boat: Bavaria 36
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Re: Black tank access

I regularly reach in with a scrubber brush through my holding tank inspection and clean it and disinfect it. Arm goes in to the shoulder quite handily.

( I worked on farms as a boy , sh1t holds no fear for me )
Interested in smart boat technology, networking and all things tech
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Old 13-08-2022, 09:55   #7
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Join Date: Jan 2014
Location: St Michaels MD
Boat: F&C 44
Posts: 181
Re: Black tank access

I had a 1980 Hunter Cherubini 37 and the original factory holding tank was aluminum, bad idea. By 2003 when the boat was new to me the holding tank was like swiss cheese, replaced it with plastic and installed an inspection port, no more smell.
More than likely by now your original aluminum tank was replaced but if not it should be done, and with an inspection port.
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