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Old 04-20-2024, 02:41 PM   #1
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2018 30' International
haymarket , Virginia
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Freshwater Dropping, Blackwater Filling

Thanks in advance for any insights on this one.

2018 International 30RB.

It sat for a week with Freshwater @ 100, both tanks at 0.

Hooked to electrical power but no external water, pump was in the "on" position.

After a week, Freshwater is at 70. Blackwater at 38. Grey water still at 0.

The gauges are correct. Freshwater was low (added to fill back up) and blackwater had water it in (straight fresh water, no waste).

No visible leaks in the unit inside or out.

How is the freshwater getting into the blackwater tank?
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Old 04-20-2024, 03:27 PM   #2
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Originally Posted by davesturner View Post
Thanks in advance for any insights on this one.

2018 International 30RB.

It sat for a week with Freshwater @ 100, both tanks at 0.

Hooked to electrical power but no external water, pump was in the "on" position.

After a week, Freshwater is at 70. Blackwater at 38. Grey water still at 0.

The gauges are correct. Freshwater was low (added to fill back up) and blackwater had water it in (straight fresh water, no waste).

No visible leaks in the unit inside or out.

How is the freshwater getting into the blackwater tank?
Many times the bathroom sink will be plumbed to the black tank and if your bathroom sink faucet leaks this would gradually fill the black tank. If this is the case you will notice your pump running very briefly every so often.
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Old 04-20-2024, 05:44 PM   #3
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2018 30' International
haymarket , Virginia
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Thanks! I will definitely check that out....and I do believe there is a slow drip from the vanity sink. Another repair on the list.
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