I have used the same sewer hose for 10yrs. Never thought about it. For some reason just before we left I got the sewer hose out. There was this funny ZIPPPPP noise and I had a hand full of slinky. ...
I always run a bit of gray water through before trusting my hose and setup to black water. Just to "test the waters" so to speak. It is still stinky, but not as bad as the black.
I found some pinhole leaks in 2 of my cheap blue hoses at the same time.
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