Two sieves, two very different jobs
Most people buy one infuser, use it for everything, and then wonder why their cold brew tastes thin or their mug of oolong goes bitter. The sieve inside your Mosi Tea Infuser is doing more work than you think.
At one end you have the Cold Brew Sieve — bigger openings, built to let water move slowly through a full jar of leaves over several hours. At the other end sits the Mini Sieve, a tight little basket for a single mug and a fast steep. Same body, same twist-on lid. Different holes.
If you drink a 16 oz mug at your desk every morning, the Mini Sieve is the one you'll reach for. If you fill a mason jar on Sunday night and pour from it all week, you want the Cold Brew Sieve. Simple as that.
Leaf size changes the answer
Here's where it gets less obvious. Sieve choice isn't only about volume or time — it's about what's sitting inside the leaf.
Take Rooibos Lavender Tea. Rooibos is a needle-leaf blend, and those fine pieces slip through a wide sieve and end up in your cup. A Mini Sieve keeps them where they belong. The same goes for Limited Release: Chocolate Mint, where tiny cocoa nib fragments settle to the bottom of a jar if the mesh is too open.
Whole, rolled leaves behave the opposite way. Something like Black Peach or a citrus-forward oolong needs room to unfurl. Cram whole leaves into a tight basket and they steam instead of steep. That's the flat, slightly stewed taste people blame on the tea when the real problem is the tool.
Rule of thumb I use: crushed, cut, or dusty leaves go fine. Whole rolled leaves go roomy.
What's actually in the kits
Buying a sieve on its own is fine, but the starter kits usually save you a second purchase later. Worth knowing what each one holds.
- Mug Infuser Starter Kit — the Mosi Tea Infuser plus the Mini Sieve, set up for single-mug brewing.
- Brew Anything Starter Kit — this is the one that covers both ends of the range, so you're not choosing between cold brew and quick steeps.
- Black Tea Starter Kit — built around black leaf, which means the sieve sizing leans toward whole-leaf expansion.
If you already own the infuser body and just want the other sieve, buy the sieve. If you're starting from zero, the Brew Anything Starter Kit is the honest answer, because most people end up wanting both mesh sizes within a month.
Matcha and fine powders are a separate problem
Matcha doesn't steep. It suspends. That single fact breaks most sieve logic.
With Vanilla Matcha Tea you're whisking powder into water, not extracting from leaves. A standard sieve will just hold the powder hostage. This is why there's a dedicated Matcha Sieve — it's designed for sifting and blending rather than steeping.
Fruit-forward greens sit somewhere in between. Green Strawberry has fine particulate from the fruit pieces along with green tea leaf, so a medium mesh handles it better than either extreme. If you're drinking both matcha and loose leaf in the same week, keep two sieves on the shelf. Swapping them takes three seconds.
Gifting without guessing
Tea gifts fail for one reason: the person gets leaves and no way to brew them properly. A tin alone is a polite gesture. A tin plus the right sieve is a habit.
Pair a Mug Infuser w/ Sieve with a seasonal tin and you've given someone a complete morning. The Silicone Sieve is the lighter option if you're shipping something and want to keep the parcel flat — it packs down and survives being tossed in a bag.
For a bigger gesture, the Ultimate Mosi Tea Starter Bundle covers brewing gear and a range of teas in one box, which works well when you genuinely don't know what the recipient drinks.
One last thing: check what sieve is already in their cupboard before you buy. Duplicate Mini Sieves are the most common tea gift mistake I see, and it's an easy one to avoid with a two-line text message.
