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Old 09-29-2022, 01:52 PM   #1
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Gray Tank Issue

We have a 2016 Holiday Rambler Endeavor 40DP. We bought it new and have been full-time more than five years. In the past month our gray tank level increases by 3-5 gallons per eight-hour period and I'm unable to locate the cause. We have three sinks and one shower that empty into our 75 gallon gray tank. We have no leaky faucets. This only occurs when we are hooked to city water. Somehow water under pressure is bleeding through to the gray tank. Any thoughts?
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Old 09-29-2022, 11:10 PM   #2
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There is NO direct path for city water to grey tank
Has to go thru a Faucet (Sink/Shower/Washer) then down a drain to get to grey tank


increases by 3-5 gallons per eight-hour period

HOW are you measuring that??
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Old 09-30-2022, 07:54 AM   #3
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Do you have a new under-counter or other type of built-in RO system? If so, there's a good chance that when it is producing RO water to the pressure tank it is discharging membrane waste water to the adjacent sink drain. On our '06 Dynasty, we had whole house RO but we discharged the waste into the drain manifold from the holding tanks. Just a possibility.
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Old 09-30-2022, 08:14 AM   #4
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We have an aftermarket Seelevel II tank monitoring system that's digital and works very well. I can see small amounts of increase. I understand that there should be no tie-in to the gray tank, but it's definitely going up without running any water.

We are not using any type of RO system.

Thanks for your input. I'm baffled by this.
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Old 09-30-2022, 08:21 AM   #5
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The SeeLevel system is GREAT!! We had that, too, and I would expect it to be pretty accurate. (Note that even the SeeLevel system isn't really accurate to the incremental percentage point, but rather runs in about 4% increments. But that's still pretty darned good monitoring.). I'm running out of ideas.
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Old 09-30-2022, 11:24 AM   #6
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Quote:
Originally Posted by BLAINE P View Post
We have an aftermarket Seelevel II tank monitoring system that's digital and works very well. I can see small amounts of increase. I understand that there should be no tie-in to the gray tank, but it's definitely going up without running any water.

We are not using any type of RO system.

Thanks for your input. I'm baffled by this.
Fill fresh water tank and use on-board pump
Pump discharge & city water fed same plumbing line
Pump should short cycle if line pressure drops w/o any demand

Otherwise........SeeLevel II is suspect on grey tank
*which is more likely then fresh water going to grey tank W/O using faucet
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