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That's the other thing I wondered, whether they drain as well.
Lifting the trap seems logical, just wondering how easy it is and how it plays out irl. What appeals is that if water drains along the whole length, you could have a mini version of those gutter leaf blockers - it would be amazing if someone made a disposable biodegradable one.
hugo7
We looked at something like this. As I recall it came with some kind of pump that activated when the trap was filling.