Yep, dust and/or floor sweepings – and if you can’t see what’s in the bag, don’t buy it.
For me, it’s either loose leaf or bags which clearly contain pieces of leaf.
Anything else is tasteless, marketing bullshit and tending to misrepresentation.
Suggestions…
Loose Leaf – kenya, assam, darjeeling, lapsing souchong
In bags…
Teapigs – chai, darjeeling earl grey, everyday brew, silver tips white
Dragonfly – gunpowder green, jasmine pearls
Waitrose own brand – english breakfast, jade oolong
Always drink tea without milk or sugar.