Eww! Don't flush tampons either.When we first moved into our house the previous owner warned us that the toilet really struggled to flush and plunging it didn't work neither did snaking it. My husband finally called a septic company to come out and the guy found a huge clump of tampons the previous owners wife had flushed down the toilet. My husband told the previous owner and his wife said "but the box says flushable!!"
Flushable doesn't mean septic safe. You have to get septic tank specific things. I hope they didn't ruin your sceptic tank by putting the wrong chemicals and shit into it.
Diapers don't flush well either specifically the adult form (and neither does regular underwear) my work was closed for two days because somebody tried to flush an adult diaper and it plugged the main sewer line out of the building and caused a huge backup. Grade A nightmare fuel!
* one at a time
That's usually what's on the package