I normally use just a teapot (without a strainer/infuser).
If I use a infuser I normally use big ones, you get more flavour from your tea if the tea isn't "crowded". I have had one like you #0 but it was way to small so I never used it.
I think the rust problem has alot to do with the water. I have never had anyone of my tea infuser rusting, and I can keep tea in them for week just because I forgot.
My mother in law on the other hand have rust in all her tea infusers, but she have iron rich water.
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