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We pour all liquid waste with exception of water down the toilets.
My pet hate is the lav sinks constantly blocking.
I am the only one who seems brave enough to dismantle the plug and get to the mesh filter and rinse it in boiling water several times (older 330/340)
You want to heave in doing so with what is attached to that insert
However, I will not block off a lav if I can fix a blocked toilet or sink.
Most crew will not attempt to do so which is understandable... Why should we have to!