Originally Posted by HiJoeSilver
If it's been in there for less than a few weeks it shouldn't be not fresh. Many rv shops and wallyworld have an additive to help keep the water fresh. It's basically a non chlorine bleach. I use 2 oz in my 40 gallon FW tank.
Then again I don't drink water very much. Doesn't taste bad though.
Depending on the weather, I'm ok with water staying in the tank for a little extra time. If it's warm, maybe a week. Colder, I'm comfortable with 2 or 3 weeks. I generally rely on my wife to tell me because she has a better sense of taste & smell.
CDC recommends 1/8 tsp in 1 gal to make questionable water safe to drink. For our 40 gal tank, it's a scant 5 teaspoons. Drive around for a few minutes to mix well & wait 30 minutes. I haven't needed to do this yet because we just don't keep water around that long and I fully drain in between trips.
If you ever get to a point where you need to do this, the above procedure will only be a band-aid fix. The bugs-n-stuff are have already started to grow in the tank and this procedure won't effectively get all of them. It should be sanitized.
Sanitizing the tank is different. I use 1 tbsp per gallon. 10 minute contact. Drain. Refill. Drain again. Then it's good.