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Old 05-11-2016, 08:12 PM   #1
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What to do with fresh water tank between trips?

From around the end of March thru October we are out in our Class C about every two to three weeks. We live in Oregon and we belong to some private RV parks. Almost always have water and electric hook-ups (and more often than not sewer).

We carry about 1/4 to 1/3 (15 to 20 gals) of fresh water. Mostly to flush the toilet. We rarely use it for cooking or drinking.

The question is...do we empty the tank after every trip and then put more water in prior to the next one?? Do we sanitize/chlorinate the water (a little bleach) and leave it for a month or better?

Suggestions and comments appreciated.
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Old 05-11-2016, 08:21 PM   #2
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I'd pull the drain on the tank between trips, refill with a fresh load of 10-15 gal. while loading up for the next trip. The water would probably be fine left for 3 weeks, but why tempt fate? If you're filling with treated, 'city' water, it should keep tank O.K. If you're using well water, you might dose with bleach more than once a year.
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Old 05-11-2016, 08:26 PM   #3
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Quote:
Originally Posted by Oregon View Post
From around the end of March thru October we are out in our Class C about every two to three weeks. We live in Oregon and we belong to some private RV parks. Almost always have water and electric hook-ups (and more often than not sewer).

We carry about 1/4 to 1/3 (15 to 20 gals) of fresh water. Mostly to flush the toilet. We rarely use it for cooking or drinking.

The question is...do we empty the tank after every trip and then put more water in prior to the next one?? Do we sanitize/chlorinate the water (a little bleach) and leave it for a month or better?

Suggestions and comments appreciated.
We use are RV once a month, for a couple of days.

I am not sure you have too empty the water, but I do, it just a flip of the lever to empty it, I just like the idea of nothing can start smelling or growing, I am probably being overly cautious but it really does not take that much time.

The day before we leave, I turn on the fridge, add my water and hook up my Jeep.

I also drain my water heater. I live in the Southwest were are temps are higher so I would think its a higher opportunity for the water to start smelling.

You could always skip a trip drain every other trip.
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Old 05-11-2016, 08:30 PM   #4
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Quote:
Originally Posted by Oregon View Post
From around the end of March thru October we are out in our Class C about every two to three weeks. We live in Oregon and we belong to some private RV parks. Almost always have water and electric hook-ups (and more often than not sewer).

We carry about 1/4 to 1/3 (15 to 20 gals) of fresh water. Mostly to flush the toilet. We rarely use it for cooking or drinking.

The question is...do we empty the tank after every trip and then put more water in prior to the next one?? Do we sanitize/chlorinate the water (a little bleach) and leave it for a month or better?

Suggestions and comments appreciated.
When we don't use our coach for a month or so, we generally add a little bleach (maybe a tablespoon or two) to the fresh water tank just as a preventive measure. The chlorine in tap water breaks down fairly rapidly on it's own, so it's a good idea to add a little. Easiest way is to hook up your normal fill hose, pour the bleach into the hose, then hook up to water spigot and force the bleach into the tank. Easy, peasey, and you will never have a problem with "stuff" growing in your fresh water tank!
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Old 05-11-2016, 08:42 PM   #5
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I am another for emptying, sitting water breeds funny things and colors. Best to empty it let it air out (leaving valves open) and fill it accoringly for the present trip. I do use a filter to put water in as well as filters taking water out makes the boss feel better. Our dogs get water from the tank and not necessarly from the inside facuets that work from the city water connection, another reason. I dissenfect every 6 months.
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Old 05-11-2016, 08:43 PM   #6
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We use city water about 98% of the time to fill tank so figure treated water is safe for some time in the tank--at least a month. We use a multi-function charcoal filter in the kitchen for cooking and cleaning. I drain/flush/check anode rod in the hot water heater at least once a year--at that time I use bleach to clean the fresh tank ..... 13 years and 160k miles--no water-born illnesses yet [smile].....
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Old 05-11-2016, 08:47 PM   #7
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If I have treated water in the tank I'll leave it between trips. If not I just open the drain, and fill before the next trip.
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Old 05-11-2016, 09:16 PM   #8
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Quote:
Originally Posted by Oregon View Post
From around the end of March thru October we are out in our Class C about every two to three weeks. We live in Oregon and we belong to some private RV parks. Almost always have water and electric hook-ups (and more often than not sewer).

We carry about 1/4 to 1/3 (15 to 20 gals) of fresh water. Mostly to flush the toilet. We rarely use it for cooking or drinking.

The question is...do we empty the tank after every trip and then put more water in prior to the next one?? Do we sanitize/chlorinate the water (a little bleach) and leave it for a month or better?

Suggestions and comments appreciated.
If it is city water, just leave it in the tank. There is enough residual chlorine to prevent bad things from growing in your water system.
I leave ours for a couple months without a thought of it turning bad.
This EPA paper should help: http://ndep.nv.gov/bsdw/docs/disinfe...king_water.pdf
if you desire to insure you have safe drinking water.
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Old 05-11-2016, 09:52 PM   #9
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We use bottled water for drinking and cooking, even in the sticks and bricks. I sanitize the MH fresh water tank a couple times a year. Don't drain other than then. Almost always use city water from home to fill. Use the onboard water fairly often, but still will be a month or three between cycling it over.
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Old 05-11-2016, 10:32 PM   #10
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What to do with fresh water tank between trips?

I'm now in the process of trying to clean out the black slime in my tank that formed after some amount of water was left in the tank for at least a year. I'll be draining mine between trips in the future for sure.
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Old 05-11-2016, 10:40 PM   #11
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I'm now in the process of trying to clean out the black slime in my tank that formed after some amount of water was left in the tank for at least a year. I'll be draining mine between trips in the future for sure.
You'll find the same slime in your municipal water lines and even your well water lines as well as inside the water lines in your rig and stick house. Spent some time designing, redesigning, building and rebuilding water lines as part of highway construction projects.
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Old 05-11-2016, 10:50 PM   #12
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What to do with fresh water tank between trips?

Quote:
Originally Posted by Mr_D View Post
You'll find the same slime in your municipal water lines and even your well water lines as well as inside the water lines in your rig and stick house. Spent some time designing, redesigning, building and rebuilding water lines as part of highway construction projects.

Well, it drops pieces of this slime out every time I drain it. I think I'm going to try the Thetford 2 step product to clean and disinfect it. I've never seen this much slime in a water line.

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Old 05-12-2016, 07:26 AM   #13
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I'll admit. I'm a drainer. Pulling a trailer, we have no need for the sink or potty while traveling. There is just too many places to stop for a break now that have facilities. Some better than others. Water is heavy and can somewhat affect towing as it move around, especially a tank not full. My main thing is why carry all that weight if you don't have to. I turn off the w/h and run the hot at the two sinks to top off the grey tanks for dumping and to remove all the hot water from the w/h for draining. I remove the anode rod and store it for the next trip to drain it.
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Old 05-12-2016, 09:36 AM   #14
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No need to drain, just add as needed.
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