I am in the same boat with trying to clean my tanks.   I don’t think they have 
been used in about 10+ years and were filled with winterizer solution for 
probably the whole time.

I have flushed them probably 50 times at this point, bleach, etc and still 
cannot get rid of the smell.

It seems to smell worse after they have set a bit so I am assuming the chemical 
is either settling to the bottom, or the tanks are just leaching the smell.   

I’m hoping to not have to change the tanks but afraid that is where it is 
headed.

Donald






On Jun 13, 2016, at 2:42 PM, Michael Brown via CnC-List <cnc-list@cnc-list.com> 
wrote:

> The pull out platform the settee cushions sit on can be lifted off. Under 
> that is an access
> plate that screws off. I usually in the spring use a clean microfiber cloth 
> and wipe down
> the tank with clean water and a little bit of bleach.
> 
> There are various chemicals you can add ( Sudbury Aqua Fresh and such ) that 
> work well.
> 
> I routinely add a small amount of bleach, maybe a tablespoon per 5 gallons, 
> when refilling
> the tank.
> 
> Michael Brown
> Windburn
> C&C 30-1
> 
> Listers- 
> 
> My 30-1 has developed a bad odor in the water tank under the starboard settee 
> (the tank that supplies the galley sink). 
> 
> Any tips on how to get rid of it? I'm tempted to pour some bleach in the tank 
> but wanted to check with you all first to see if there is any risk of 
> damaging the material from which the tank is made (fiberglass, I think - the 
> tank seems to be a molded part of the settee). 
> 
> Note I don't drink that water or even use it for cooking. I mainly use it for 
> cleaning. 
> 
> Thanks in advance. 
> 
> Cheers, 
> Randy Stafford 
> S/V Grenadine 
> C&C 30-1 #7 
> Ken Caryl, CO 
> _______________________________________________
> 
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