Every day's a school day

We've always used Co-op loose leaf  tea, probably because both mine and MrB's  parents and grandparents also did. I've not found a nicer drink.
When I was a kid my Gran claimed tea bags were made from the sweeping ups and she wouldn't have them in the house.

We visited a tea plantation & factory in Sri Lanka. Watched the leaves being picked , then to the factory with their huge drying machines and to the packing area where the tea went into packets for retail.
The question was asked - what happens to the sweepings and he gave the same answer as your Gran!! May have been joking but teabag tea is very fine, compared to "real" tea.