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Old 10-03-2011, 07:56 AM   #11
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Originally Posted by KyDan View Post
That's really technical. Most folks won't have a test kit nor want to run
out and purchase one.

Regular Clorox bleach is 8% chlorine.
How many cups would be needed to raise the chlorine level in a 25 gallon
water tank to the recommended 200 Parts per million
Originally Posted by KyDan View Post
THAT's what I said in the first place
You asked but yes that was your first suggestion!

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Old 11-03-2016, 03:16 PM   #12
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Same problem

I revived this older thread since it applies almost exactly to my situation when I too bought a Roo 23ss that had water left in it. The advice given the original poster has been invaluable: I've replaced the vent hose because it was clear and the growth was viewable. I've done three clorox and water treatments and seem to still have a large dark area(spot) on the inside of the tank.( How could I have neglected to replace the fill hose? that's next.)
My question is this: are there any tips to really knock down the apparent growth on the tank insides? I'll try to put chucks of ice down the fill hose just as we leave the house tomorrow but after that I'm out of ideas.
I sure don't want to wrestle the tank out and replace it.

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Old 11-03-2016, 07:57 PM   #13
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If your fill tube isn't very long, you may be able to snake a flexible blackwater tank wand into the tank and rotate it to try and pressure wash the inside of the tank. It goes without saying that you would want to purchase a new one for this application. But considering that they are right around $12 it would be worth a shot.
Hope it helps,
Tom G
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Old 11-03-2016, 08:27 PM   #14
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Originally Posted by Ovair View Post
I would also suggest driving it around while full of chlorinated water. The sloshing serves to break loose some of the matter.
X2. Hit it with the bleach and give it a good ride. Bumpier roads, too. Then follow procedure for cleaning. I had a similar issue on my PUP. A bit of a pain, but after a couple trips, all was well. . Good luck. Beside, it gave me some time to see how it towed.
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Old 11-03-2016, 08:31 PM   #15
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If you could see inside of airplane water tanks you'll never drink another cup of coffee on an airplane again. And, these tanks are refilled daily...sometimes a few times a day. I don't think people get airsick, the just drink the water.
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Old 11-07-2016, 09:32 AM   #16
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Thanks to all for the help and insight. I now have a few options to follow up on.
I had trouble draining the tank this morning, just had a drip so I filled it up and the additional weight pushed out a few pieces of white fluffy debris, which I take to be the waste product of the mold growth. The stuff looks a lot like like small pieces of thin toilet paper that has sat in water and expanded.
Thanks again

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