While micron filter bags are an absolute necessity when it comes to pressing with dry-sift or bubble hash, their use is not critical when pressing from flower, and subsequently, many flower pressers don’t even consider using them. However, filter bags have a lot to bring to the solventless table, as they can improve the quality of your flower rosin immensely. 

See how micron filter bags help prevent plant material from being pressed into finished flower rosin.

What are Micron Filter Bags?

Rosin micron filters are typically bags composed of a fine nylon mesh, and they basically function in the exact same way as coffee filters. When cannabis flower is placed inside and then pressed into rosin, filter bags act as a screen to separate cannabis oils from unwanted plant materials. 

Rosin Guy showing the difference of plant material in your rosin without a filter bag.

Each filter bag will have a specific micron rating like 45µm, or 160µm for example, and this defines the size of the holes in the mesh. Generally speaking, the smaller micron filters produce a higher quality rosin, but at the expense of yield. And conversely, larger micron ratings produce higher yields, but at the expense of quality.

Why You Should Use Rosin Filter Bags 

Without micron filtering, all sorts of plant detritus will be squeezed out of your flower along with your rosin, and this will ultimately degrade the quality of your finished concentrate. If too much leaf matter makes its way into your dab, it won’t just ruin the flavor, it’ll also be much harsher and leave behind a nasty residue when vaped. 

Ultimately, micron filtering makes a huge difference to the quality of your flower rosin, and here at Rosin Tech, we don’t just recommend their use, but we see them as a critically important aspect of quality rosin making. Because of this we’ve created our own line of seamless rosin filter bags that are specifically designed for the job, so if we’ve convinced you of their worth, go check them out.

How to Choose the Right Micron Rating

Our rosin filter bags come in a wide range of sizes from 25 to 220 micron. However, the lower end of this scale is best used for finer materials like dry-sift and bubble hash. That’s because these fine meshes will crush your flower yields without providing any worthwhile improvements to quality. 


For that reason, it’s generally recommended that flower pressers stick to the 90 to 220 micron range. Which size filter bag you choose within this range depends on your aims as a rosin maker. Are you looking to produce the sweetest flower rosin possible? Then use a 90µm bag but expect to see a reduction in your yield. On the other hand, if you’re chasing maximum yield, then give the 220µm bag a try, but expect lower quality end results. Or, you can strike a balance in the middle ground with a 120 or 220 micron bag (which is what we would recommend). These will give you good filtration without affecting your yields too badly.

Are Filter Bags Worth Using?

Ok let’s be honest, if you’re a simple home presser who squeezes out 1gram nugs at a time, then the extra time, effort, and money involved with using filter bags probably isn’t worth it for you. However, if you’re pressing larger amounts, or just looking to improve your solventless game in general, then micron filter bags are absolutely worth the extra expense. Because using them simply produces a better concentrate, end of story.