I left it open once and a small poop pyramid formed. 🤢🤮 We always double check now! NEVER leave the black tank valve open!! The black tank on your RV needs lots of water to work properly. Leaving the black tank valve open alows any liquid to escape leaving behind only solids that will build up and not break down. Then you have a problem! #professionalcamper #professional #rvliving
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