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For vapers who use refillable pod systems, knowing the right amount of e – liquid to leave in the pod before refilling is a key part of getting the best vaping experience. It’s not just about pouring in more juice; it has a big impact on how well your device works, how long its parts last, and even how your vape tastes. Let’s take a close look at this important part of pod maintenance.​

1. Why the Amount Left Matters​

First, let’s understand why the leftover e – liquid in the pod is so important. Pod systems, whether they’re the small ones for beginners or the more advanced ones, rely on a careful balance between the e – liquid, the coil, and the airflow. If you let the pod get too empty, the coil might not be properly covered by the e – liquid. When the coil isn’t covered, it can get too hot when you vape. This “dry hit” not only tastes really bad, like something burning, but it can also damage the coil. Replacing coils often adds to the cost, which goes against the money – saving benefits of using refillable pods.
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On the other hand, if you leave too much e – liquid in the pod before refilling, you might overfill it when you add more. Overfilling can cause leaks. The e- liquid can seep out through the airflow holes or around the coil, making your device sticky. It can also get into the battery part, which is dangerous and can shorten the life of your pod system.​

2. The General Rule: The 20% Mark​

Most vaping experts agree that the sweet spot for the amount of e – liquid to leave in the pod before refilling is around 20% of the pod’s total capacity. Let’s make this more concrete. If your pod can hold 2ml of e – liquid, you should start thinking about refilling when there’s about 0.4ml left. This 20% acts as a safety net for the coil. It keeps the wick that soaks up the e – liquid wet enough, preventing it from drying out when you take a puff while you’re refilling.
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This rule works well for standard pod systems that are used normally. The 20% leftover e – liquid makes sure that the coil stays in good condition during the refilling process. It also leaves enough space in the pod to add more e – liquid without overfilling it, which reduces the risk of leaks.​

3. Adjusting Based on Pod Design​

Not all pods are the same, so you might need to change the 20% rule a bit depending on how your pod is designed. Let’s look at some common types:
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These pods have a filling hole on the top, and you don’t have to take them out of the device to refill. For these, the 20% rule usually works perfectly. Since you can see the e – liquid level more easily when refilling, you can be more precise. Just keep an eye on the leftover e – liquid through the pod’s clear window (if it has one) and add more when it gets to that 20% mark.
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  • Bottom – Refillable or Removable Pods​
Some pods need to be taken out of the device to refill, and the filling hole is on the bottom. For these, you might want to leave a bit more e – liquid, maybe 25 – 30%. When you take the pod out, there’s a higher chance of spilling. The extra e – liquid reduces the risk of the coil drying out if there’s a small spill during handling. Also, when you put the pod back into the device, the pressure change can push a little e – liquid out if the pod is too full, so having a bit more leftover gives more room to avoid this.
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  • Pods with Cotton Wicks vs. Ceramic Coils​
Pods with traditional cotton wicks are more sensitive to dryness. Cotton dries out quickly, so sticking to the 20% rule is very important. If you let the e – liquid level drop too low, the cotton wick might not soak up enough e – liquid, leading to a dry hit right away.​ Ceramic coils are more forgiving. They can handle a slightly lower e – liquid level, maybe 15 – 20%, because ceramic holds onto e – liquid better. But even with ceramic coils, it’s not a good idea to let the pod get almost empty. The coil can still get too hot, which can change the taste of your vape.​

4. What Happens When You Get It Wrong?​

Let’s look at the problems that can happen if you don’t get the amount of leftover e – liquid right, to show why this is so important.
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  • Too Little E – Liquid: Dry Hits and Coil Damage​
If you let the pod get down to 5% or less of its capacity, the wick will struggle to get enough e – liquid. When you press the fire button, the coil heats up, but there’s not enough e – liquid to vaporize. This leads to a harsh, burning taste in your mouth – a dry hit. Even one bad dry hit can burn the wick, leaving a permanent bad taste in the pod. Over time, repeated dry hits will ruin the coil, and you’ll have to replace it much sooner.
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  • Too Much E – Liquid: Leaks and Gurgling​
Leaving more than 50% of the e – liquid in the pod and then refilling can make the pod too full. When you vape, the coil creates pressure, and the excess e – liquid can be pushed out through the airflow, causing leaks. You might also notice a gurgling sound, which means e – liquid is getting into the airflow chamber. This can lead to “spit back,” where small drops of e – liquid hit your mouth when you vape – not a pleasant experience.
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5. Tips for Checking the E – Liquid Level​

Not all pods have clear windows to see the e – liquid level. Here are some ways to tell when it’s time to refill:
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  • Taste Test: If your vape starts to taste weaker than usual, it’s a sign that the e – liquid level is low. This is your first clue to check the pod.​
  • Vapor Production: Less vapor than normal can also mean there’s not enough e – liquid to be vaporized.​
  • Weight: Get used to how heavy the pod feels when it’s full vs. when it’s low. This can help you guess the e – liquid level when you can’t see it.​
  • Time Tracking: If you vape regularly, keep track of how long it takes for your pod to go from full to needing a refill. For example, if you know you need to refill every 2 days, set a reminder to check the e – liquid level on the second day.​

6. Common Myths to Debunk​

There are some wrong ideas about leaving e – liquid in the pod that can lead to bad vaping experiences:
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  • Myth 1: “I should empty the pod completely to clean it.” While cleaning your pod is important, emptying it completely every time can dry out the wick. Instead, leave that 20% and rinse the pod with warm water every few refills if needed.​
  • Myth 2: “More leftover e – liquid means better flavor.” No, in fact, too much can dilute the new e – liquid you add, making the flavor less strong. It can also cause leaks, which will ruin the flavor.​
  • Myth 3: “Dry hits are just part of vaping – they don’t hurt the coil.” This is far from true. Dry hits burn the wick, and once a wick is burned, it will keep giving off a bad taste until you replace the coil.​

7. Final Tips for Perfect Refills​

  • Take It Slow: When refilling, don’t rush. Adding e – liquid too quickly can create air bubbles, which can make the wick not soak up the e – liquid properly.​
  • Check for Leaks After Refilling: After adding e – liquid, wait a minute before vaping. This gives the wick time to soak up the e – liquid. Then, take a few small puffs without pressing the fire button (if your device allows it) to help the e – liquid move through the wick.​
  • Adjust for E – Liquid Thickness: VG (vegetable glycerin) – heavy e – liquids are thicker and take longer to soak into the wick. For these, you might want to leave a bit more e – liquid, around 25%, to make sure the wick stays wet. PG (propylene glycol) – heavy e – liquids are thinner, so the 20% rule is fine.​
In conclusion, keeping around 20% of e – liquid in your pod before refilling is a good general rule, but you can adjust it based on your pod’s design and the type of coil you’re using. This simple step can make a big difference in how long your coils last, how good your vape tastes, and how much money you save in the long run. So, the next time you reach for your e – liquid bottle, take a second to check the level – your vaping experience will thank you.​

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