How to Use a Flum Vape — First Puff to Last Puff

Unbox + verify your Flum

Every Flum ships in an outer carton with the inner device box sealed inside. The inner box has a silver scratch-off security code printed on one side. Before you take the device out, scratch the foil with a coin — there's an 8-character alphanumeric code under it. Open Flum's verification portal in your phone browser and type the code. Green check means genuine; red means email us at service@flum-vape.com with the code and order number.

Our crew runs this same scratch step on every box we receive from Flum at the Greenwood, IN warehouse before the pallet goes onto our shelves. If a code fails our verification scan, that box doesn't ship to anyone — full stop. Doing it yourself once you receive your device is the second layer.

First puff — draw-activated, no button needed

Take the device out of the inner box. There's no power button to press, no e-juice to prime, no firmware to update. Every Flum ships pre-filled and pre-charged enough to vape immediately (typically 50-70% from the factory). Put the mouthpiece to your lips and inhale gently — the coil heats automatically when the sensor detects airflow, vapor comes out within half a second.

The first three or four puffs may taste slightly muted because the cotton wick is still saturating. By puff five the flavor is at full strength. If you draw too hard on the first puff and get a harsh hit, ease off — the Hybrid 2.0 Mesh Coil in the Mello (or Dual Mesh in the UT family) responds to a slower, longer pull better than a short snap.

Reading the screen — what the icons mean

The Mello 20K and Float Mello Pro 50K have a Mega HD or Smart HD color display that segments out two things: battery level on top, e-liquid level on bottom. Each row reads in 4-5 segments — full = all lit, ~25% = one segment lit. The UT Bar Pro 25K's Smart LED screen runs animated Cosmos patterns plus the same battery/juice readout.

The UT Bar Pro 50K's Mega HD screen adds a third element: which tank is currently active. There's a small A/B indicator that flips when you click the side button to switch tanks. Both tanks show their juice level independently — if you've been favoring Tank A all session, Tank A's bar will be shorter than B.

Red screen or fast blink means battery below 10%. Plug it in. White or steady green means full charge. If neither tank is firing on the UT 50K and the screen is dark, hit the button five times rapidly to confirm the device is unlocked.

Switching tanks on the UT Bar Pro 50K

This applies only to the UT Bar Pro 50K — the only Flum device with two simultaneous flavor chambers. The side button is your tank switch. Click once and the screen indicator flips from A to B. Your next inhale fires Tank B's coil instead of Tank A's. There's no re-prime, no airflow change, no warm-up — just a different flavor on the next puff.

You can switch as often as you want. Mid-puff switches don't work — the coil that's heating completes its hit — but back-to-back puffs alternating between tanks is exactly what the device is designed for. Both tanks share the 50,000-puff total; if you puff Tank A 30,000 times and Tank B 20,000 times, the device hits its rated end.

When the device is done

The end is usually obvious: both juice and battery bars hit zero on the screen, and the next inhale gives weak or no vapor. Some users report a faint burnt taste in the last 50-100 puffs — that's the wick going dry. Stop puffing and discard the device responsibly (vape disposal stations at most US gas stations, or your local hazardous-waste drop-off).

Don't try to recharge a device that's out of juice — the coil will burn dry and either taste terrible or fail to fire. Don't try to refill the pod either; Flum disposables are closed systems and refilling voids the device's safety design. If you finish a device sooner than you expected and want to know per-puff math for your next order, the Flum vape price breakdown has the full math.

Most days, the only "instruction" you need is "inhale on the mouthpiece." The screen is honest about what's left, the device handles the rest. Flum Support Team · Greenwood IN

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