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Old 04-19-2021, 10:35 AM   #1
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De-winterize anti freeze question

This is my first spring with our Forest River Sunseeker 3050. I did winterize with the pink anti freeze last winter. I know I need to sanitize my fresh water tank ( I did not put any anti freeze in there ). Do I need to remove the anti freeze from the gray and black tanks? Or is it okay to wait until we use the RV for a trip and dump the gray/black tanks?
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Old 04-19-2021, 11:39 AM   #2
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Answers are yes, no, and yes. 1)The fresh water tank had some moisture due to condensation so there could be some nasty stuff growing. Put about a cup of bleach with half tank of water in the tank (ratio isn't critical). Let it sit overnite, then drain the tank, rinse 1 or 2 times, then refill. I use bottled water for at least first time out for drinking, until there is ZERO smell of bleach coming from faucet. The other thing I've done after bleaching the tank is to leave it in while driving first day, then use a full hookup site, open the greay water tank and open the faucets flushing system out 2) No need to do anything with these tanks, 3) OK to leave wastewater tanks as is until you use coach.

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Old 04-19-2021, 01:31 PM   #3
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Thanks Skip Y. I did do the bleaching of the fresh water tank last year but I like your suggestions. Good to hear it is okay to leave the anti freeze in the gray and black tanks.
Thanks again. I have so much to learn.
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Old 05-15-2021, 10:30 PM   #4
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1/2 tank of (bleach solution/ mixture) does not sanitize the UPPER portion that is not immersed; tank should be FILLED
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Old 05-17-2021, 10:43 PM   #5
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Add bleach to main tank. Run water to every facet until you smell bleach. Also run it through the water heater. Let sit, how long depends on concentration of bleach. Dump fresh water tank and water heater. Refill and run the system until no more bleach smell from any facet. Special procedures may be needed for ice maker, washers, etc.

Some people sanitize their system every few weeks, some never do it for years.
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