cleaning the fresh water tank

Hello Swanson,

Manual for Shurflo 4008 RV Revolution Bypass Pump says to sanitize with 2 oz. bleach per 15 gal. tank size; fill tank and rock rv back and forth to coat top of tank; let sit for 4 hours of contact time. Or double the amount of bleach to reduce contact time to 1 hour.

Let me know how that works out.  It took several tries to get a good 'solution' so that the water didn't end up smelling like bleach or RV antifreeze upon drinking.  Nipped the antifreeze problem after the first winterization in 2011 by simply blowing the system out with compressed air.  A quick and easy solution for that.  I go with 80 psi and always leave one line open while going through the other hot, cold, and toilet outlets; takes under 2 minutes to go through all lines twice.  After using this process for two years and then removing both low point drains afterwards to make sure all water was out I was surprised that only 1 or 2 drops of water would be remaining in the low point drains so after that I haven't removed those for the past 13 years after blowing out.  Northern Michigan and yes, we get cold winters.  No cracks, leaks, or issues with this process.

https://www.simplyrecipes.com/stop-mixing-baking-soda-and-vinegar-scientist-8750981Folks have been mixing vinegar (acid) with baking soda (base) for years, sometimes with lemon juice (acid) for odor. It is a folk remedy that is not recommended.