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Old 12-01-2020, 12:14 PM   #1
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Fresh water draining into grey tank overnight?

Hello all, first post on here so bear with me. My wife and two babies just started full time RV living. We are in a hemisphere 378. Due to some water source issues with the city water, we had to resort to filling the fresh tank and using that until our water source is fixed. Last night we filled the fresh tank 2/3 full, we each took a shower and no other water use. This morning when we woke up, the fresh water tank was empty and the Grey tank was 2/3 full. Has anybody come across this issue? Any advice would be much appreciated!!
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Old 12-01-2020, 12:26 PM   #2
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The first question that would come to mind, is how much water was used for the showers? Perhaps you didn’t check the water supply right after the showers, but instead checked it the next morning. If you took showers with water usage like you would in a house, I could see how you would drain the fresh water tank just from the shower use, assuming you have an on demand water heater that could keep enough hot water flowing.

In my RV, anyway, there is no connection between the fresh water supply and the grey tank except through the drain traps of the shower and the two sinks. Do you have any other water using appliances, such as a clothes washer? From the looks of the floor plan, I don’t think it does.
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Old 12-01-2020, 12:43 PM   #3
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Hey, thanks for a response. i don't know the capacity on the freshwater tank on this RV, but i know it's in the ballpark of 50 gallons. We have a 13 gallon water heater on it as well. I know i didn't run out of hot water, and i don't believe my wife did either. I could estimate we used 25 gallons at most, since the water heater was previously full from the city water connection. I'm working and haven't had a chance to look into anything or under the trailer, but i wanted to get some ideas before i got home.

Hopefully you are right and we just used a ton of it.


On another note. Is there a place online i can download an owners manual for this RV for free? I have all the owners manuals for the appliances and what not, but never could find anything that talked about the plumbing.
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Old 12-01-2020, 12:45 PM   #4
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Id crawl under and check out the size of the Grey Tank. My spec sheet says 40 gallons for fresh, 30 black, 40 for grey, well turns out 40 for Fresh, 40 for Black and 22 for Grey. This is on my 2021 FR Wildwood X-Lite 24RLXL.

Pretty much drain our grey tank after any shower since it too shows 2/3 full.
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Old 12-01-2020, 12:50 PM   #5
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Alright good to know, that's definitely worth checking. Thank you!!
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Old 12-01-2020, 12:54 PM   #6
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Quote:
Originally Posted by KolbyS View Post
Hey, thanks for a response. i don't know the capacity on the freshwater tank on this RV, but i know it's in the ballpark of 50 gallons. We have a 13 gallon water heater on it as well. I know i didn't run out of hot water, and i don't believe my wife did either. I could estimate we used 25 gallons at most, since the water heater was previously full from the city water connection. I'm working and haven't had a chance to look into anything or under the trailer, but i wanted to get some ideas before i got home.

Hopefully you are right and we just used a ton of it.


On another note. Is there a place online i can download an owners manual for this RV for free? I have all the owners manuals for the appliances and what not, but never could find anything that talked about the plumbing.
The only owners manuals that RV builders publish are generic. Donít expect a manual like you would get from an automotive manufacturer. You can go to the Forest River interactive manuals library and see what they provide for your RV model. Link below.

https://forestriverinc.com/Owners/Interactive-Manuals
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Old 12-01-2020, 01:41 PM   #7
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There is no direct drain from the freshwater tank to the gray tank. The freshwater tank leads to the camper’s water system. Some fixtures will run to the gray tank (shower and sink(s)).

There are 2 possibilities:
1, your showers took more water than you expected (likely)
2, someone forgot to turn off the water (this happened with my son a lot)

For #2, my son would turn off the shower head and lay it in the bottom of the shower. This would dribble water into the gray tank. Being on the pump, though, you should have heard it running.
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Old 12-01-2020, 02:00 PM   #8
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I suspect we used more water than expected after doing a little bit of math. I filled it back up and will monitor a little closer.

My main concern was we didnt notice any lack of pressure towards the end of shower #2. I thought we may have if the talk was low and air was starting to come through.
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Old 12-01-2020, 02:15 PM   #9
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Don't ever believe the sensors. It may have said 3/4 tank and been full or nearly empty. There is no direct line from the FW to a gray tank. In order to fill it the water must come from a spigot or toilet.
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Old 12-01-2020, 02:30 PM   #10
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No, not the toilet

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Don't ever believe the sensors. It may have said 3/4 tank and been full or nearly empty. There is no direct line from the FW to a gray tank. In order to fill it the water must come from a spigot or toilet.
No, not the toilet. The toilet drains to the black tank.
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Old 12-01-2020, 03:29 PM   #11
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I'm of the "sensors lie" group. In my trailer the black tank goes from empty to full whenever anything is put into it. My freshwater stays on full then goes straight to empty. They are usually very inaccurate. Learn your capacities,start out with empty tanks. Fill the fresh and monitor them closely for a few times. You'll get a feel for excessive use or a leak. Be sure everyone knows how to take an RV shower also.
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Old 12-01-2020, 04:04 PM   #12
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As others have mentioned, monitor water use and try to get by using less. Another thing that I have experienced: If RV is not level when filling water tank, water may move toward your water level sensors and show you are full and you may have only filled the tank ⅔ full. Same with tank water fill inlet, water may start to overflow out the inlet indicating a full tank and it isn't so when RV is level again.
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Old 12-01-2020, 04:24 PM   #13
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I'll jump in and say if you believe you used 25 gallons of water for two showers, you likely used way more.

Most of us R/Vers have come from the world of using less than 5 gallons of water per shower (if not on full hook-ups) to make our boondocking sources last as long as possible. (commonly called Navy showers)

Your water pressure should remain as steady with a fresh tank NEARLY empty as it does when completely full. Only when you run TOTALLY out of water and the pump begins to such air will it sputter and flow less.
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Old 12-01-2020, 04:25 PM   #14
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Tank gauges are notoriously inaccurate so you may not have had as much water in your tank as you thought. Also, there's no way the fresh water tank is connected with the grey tank unless the manufacturer made a huge and virtually unheard or error in piping. In your situation I'd fill the FW tank to overflowing next time you fill and see what happens.

And welcome to RVing. You'll find that these kind of challenges are part of the fun.
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Old 12-01-2020, 11:20 PM   #15
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Cool

Quote:
Originally Posted by CaptnJohn View Post
Don't ever believe the sensors. It may have said 3/4 tank and been full or nearly empty. There is no direct line from the FW to a gray tank. In order to fill it the water must come from a spigot or toilet.


X2 on sensors
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Old 12-01-2020, 11:58 PM   #16
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Quote:
Originally Posted by KolbyS View Post
My wife and two babies just started full time RV living !
Others have listed possible causes. I'm going to suggest that you have a few 'milk jugs' filled with water on hand in case you unexpectedly run out of water. Cleaning up after small children takes an amazing amount of water that you probably don't even realize that you're using.
Wet wipes near all sinks help too. You can clean sticky fingers without using water.
Also, you might want to pick up an Oxygenics shower head. It limits water use while giving you the feel of a real shower. At most campgrounds, you'll find the ladies showering at the campground showers because of the amount of water required to rinse the soap out of hair can empty a tank quickly.
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Old 12-02-2020, 12:44 AM   #17
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Quote:
Originally Posted by Reverse_snowbird View Post
Others have listed possible causes. I'm going to suggest that you have a few 'milk jugs' filled with water on hand in case you unexpectedly run out of water. Cleaning up after small children takes an amazing amount of water that you probably don't even realize that you're using.
Wet wipes near all sinks help too. You can clean sticky fingers without using water.
Also, you might want to pick up an Oxygenics shower head. It limits water use while giving you the feel of a real shower. At most campgrounds, you'll find the ladies showering at the campground showers because of the amount of water required to rinse the soap out of hair can empty a tank quickly.
Since your talking about wet wipes it should be mentioned do not put disposable wipes in the toilet.
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Old 12-02-2020, 10:40 AM   #18
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Since your talking about wet wipes it should be mentioned do not put disposable wipes in the toilet.
Yup, this was after *hours* of being in water:



They don't break down.
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Old 12-02-2020, 11:10 AM   #19
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Specs on the Salem Hemisphere 378 show 48 gallons of fresh water. That typically includes the capacity of the water heater, which you say is 13 gallons, leaving 35 gallons in the tank. At 2/3 full, that's 24 gallons, and you say you might have used about 25 gallons for your showers, so you apparently drained the tank.

Salem Hemisphere Specs
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Old 12-02-2020, 03:10 PM   #20
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That typically includes the capacity of the water heater...
Hey Bob, do you have any insight as to why it's marketed that way? Since the water heater is a top drain, you can't get to its water without having water in the tank. Meaning, it's essentially unavailable as "extra" water.

Just curious if you have any insight into the marketing side of things on this?
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