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Old 10-24-2015, 11:07 AM   #1
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Question Mold in fresh water tank

Even though I have sanitized the fresh water tank twice since returning from our winter run travel in March, it looks like I have mold in the tank. When I went to fill the tank with the Clorox mixture I noticed that the tank was dark on the side where I usually look to see how much water is in the tank. If it is mold how do I proceed to get the tank useable again ? It is possible to replace the tank on a Fleetwood Bounder 36D pusher ?

Appreciate your thoughts
Bill
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Old 10-24-2015, 11:20 AM   #2
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Just sanitize per the RVIA-approved instructions. Old mold doesn't disappear just because it is "killed". And most biological growth in water isn't harmful to begin with. City water supplies typically have all sorts of things growing in them.

RV NOW: Sanitize your RV fresh water tank before it's too late
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Old 10-24-2015, 11:38 AM   #3
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Also possible that you filled up from a source that had a lot of very fine clay suspended in the water and that has settled out on all pipe and tank surfaces.
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Old 10-24-2015, 05:37 PM   #4
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Does the fresh water tank have baffles? May be what im seeing is the baffles touching the outside of the tank? Water looks clear coming out of facets...

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Old 10-24-2015, 05:59 PM   #5
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Not sure what other minerals will do but sulfur can leave a brown coating that is not soluble in water or bleach. That can look black from the outside of a milky plastic tank.
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Old 10-26-2015, 01:24 PM   #6
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All tanks should be removable, regardless of type of RV. Not, I didn't know that about sulfer, great tip. I'd double up on the bleach, drive around to make sure it all around the tank, then flush the daylights out of it.
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Old 10-27-2015, 01:06 AM   #7
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Quote:
Originally Posted by Gary RVRoamer View Post
Just sanitize per the RVIA-approved instructions. Old mold doesn't disappear just because it is "killed". And most biological growth in water isn't harmful to begin with. City water supplies typically have all sorts of things growing in them.

RV NOW: Sanitize your RV fresh water tank before it's too late
True, you should see what the inside of a large fresh water pipe looks like when opened up after a few years in service.
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Old 10-27-2015, 11:51 AM   #8
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Crud does get into fresh water tanks even when you have a whole house filter. That's why I began using a filter right off the spigot and the house filter. Unbelievable what that first filter catches. We recently had the fresh water tank out after 6 years. Clean as a whistle so I am going to continue what I am doing.
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Old 10-28-2015, 04:57 PM   #9
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Water with heavy concentrations of iron will leave a stain that is extremely difficult to get rid of even with strong bleach treatments. If you have been to places with sulfur in the water, you will have smelled that right away. You usually don't smell iron. If you have been getting city water supplies, those are treated to be safe. We have been in campgrounds that have their own well water that is not treated and stayed away from putting that in our tank. Always good to ask about the water source you are going to put in your tank.

If you have treated your tank according to prescribed techniques, I would not worry about mold being in there.
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