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Old 05-10-2020, 08:36 AM   #1
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Water tank addictive?

We are newbies with a Class A. DP. What if any additives do I need to add to the fresh water, gray and black water tanks? I assume you do not use the fresh water tank for drinking normally? Thanks John
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Old 05-10-2020, 08:43 AM   #2
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With an unknown sanitize the potable (fresh) water tank using widely available instructions. As for the gray and black tanks? Nothing to clean them. Flushing them with lots of water should be all you need. As for additives, there are myrids of arguments both pros and cons. Personally I like the toss in packs. They seem to help reduce odors and are simple to use. The key to good black tank health is lots of water at each flush especially after poo. Also use septic safe TP only. No wet wipes, no sanitary products.
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Old 05-10-2020, 08:46 AM   #3
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Hi,

The grey and black tanks need to have the chemical tablets or liquid that keep the bacteria from growing and smelling bad. The fresh water tank does not get any additive normally. About once a year, I put some chlorox in the fresh water tank, fill it up and run the water pump a little to fill the lines with bleach water.
I let it sit maybe overnight, then drain it all out. Then I fill it with fresh water, run the pump and drain it all out again. My next fill is fresh water we will drink on the next trip. This is called a sanitization flush. It's important to get the bleach back out of the system.
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Old 05-10-2020, 09:06 AM   #4
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Sanitize the fresh water tank and lines annually.
We use the drop in "breath mint" citrus tablets for the black water tank.
After dumping and flushing the black tank I like to add about 10 gallons of fresh water and one dishwasher pod or 1/4 cup Dawn for the drive home.
Grey tank we add nothing, but use Dawn dish soap. No funky odors ever, but we've been blessed with great artesian spring water at home.
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Old 05-10-2020, 09:10 AM   #5
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Originally Posted by jrj89134 View Post
We are newbies with a Class A. DP. What if any additives do I need to add to the fresh water, gray and black water tanks? I assume you do not use the fresh water tank for drinking normally? Thanks John


We use the water tank to drink from when on the road or boondocking. Why not?
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Old 05-10-2020, 01:52 PM   #6
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If we did not have city water, we always used the fresh tank for all needs, including drinking. Your choice, of course. You can add some chlorine purifier if the tank was filled from an unknown water source, but if filled from a reliable city water source it will already be potable water.



No additives are required in any tank, but some people like to add an enzyme-type waste digester and odor controller to the black waste tank and maybe the gray as well. We rarely did, since they were used often enough that regular draining kept them from getting smelly.
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Old 05-10-2020, 03:46 PM   #7
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We too have always used water from the fresh tank to drink, but we run it through a filter pitcher before doing so. We also carry bottled water to carry along when leaving the camper. I use a liquid additive in the black tank, but nothing in the grey.

One thing I did do that I would recommend against is leaving the black tank with any amount of stuff in it for a period of time (several months). That was many years ago, but I still remember the feeling I had while poking through the dump valve with a stick to clear the clog and not knowing what was going to happen. There were visions of everything breaking loose and covering me, but I was lucky and it started with a trickle and I was able to close the valve, connect the slinky, and have a normal dump.

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Old 05-10-2020, 04:00 PM   #8
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I do use the fresh water tank for drinking. And I don't use any chemicals in the black or gray tank. Someone told me 20 years ago that if I wanted to get rid of the black tank smell to quit using chemicals, I did and it worked.
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Old 05-10-2020, 04:14 PM   #9
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Originally Posted by Gary RVRoamer View Post
If we did not have city water, we always used the fresh tank for all needs, including drinking. Your choice, of course. You can add some chlorine purifier if the tank was filled from an unknown water source, but if filled from a reliable city water source it will already be potable water.



No additives are required in any tank, but some people like to add an enzyme-type waste digester and odor controller to the black waste tank and maybe the gray as well. We rarely did, since they were used often enough that regular draining kept them from getting smelly.
Same here on all counts.
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Old 05-10-2020, 07:00 PM   #10
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We are newbies with a Class A. DP. What if any additives do I need to add to the fresh water, gray and black water tanks? I assume you do not use the fresh water tank for drinking normally? Thanks John
you assume incorrectly...at least as far as we go. of course we drink from the fresh water tank becyz, well, that's what it holds. fresh water. no additives..just good fresh water. we make our ice from the same water.

as for the black and gray tanks we use
https://www.happycampersworld.com consistently in the black tank and every now and then in the gray tank.
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Old 05-10-2020, 07:10 PM   #11
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There are a few parts of the country where the city or park water is subject

We try to fill in other known better quality locations and use the fresh water tank
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Old 05-10-2020, 08:31 PM   #12
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The fresh water tank needs to be sanitized before using it the first time from the dealer, or after sitting all winter with an inch of water remaining inside. Allow to sit for at least 2 hours. 1/4 cup of plain unscented bleach for each 15 G of water is the correct mixture. Turn on the water pump and run the mixture through all the plumbing lines after that 2 hours until you smell bleach at the each faucet, allow to sit another 2 hrs. Run a bit of water, if it smells of bleach the lines are sanitized too.
Drain plumbing lines and fresh water tank, add some fresh water and run through lines to remove bleach, then drain everything again.
Now you have sanitized everything and are ready to fill your fresh water tank that is now safe to drink from.
If a bit of chlorine taste remains, add 1/4 cup of baking soda per 50G of water to remove objectionable taste and/or odor.


Black water holding tanks only require plenty of water to remain in good working order. Add 3-5G of water immediately after draining, to "pre-charge" the tank, then use enough flushing water to keep ALL solids covered all the time. Only drain the black tank when it is at least 3/4 full. This volume of water has enough force to carry solids away.
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