Sorry, another ignorant here! I remember back when I started my period the instructions were to tear towels in half and flush, and to flush tampons (although not applicators)
Before everyone gets too upset, I don't flush them at home as we're on a septic tank, and I don't flush them when out if there's a sanitary bin provided. I have been flushing them elsewhere though
but won't now!
Hopefully I'll have a mooncup soon. We've had a run of 'tight' months and I haven't had enough left in the kitty yet, but it won't be long.