What is Reddit's opinion of iPower GLFILTPREFILT12L 12 Inch Replacement Prefilter for 12"x 48" Air Carbon Filter, 12"x48" Pre, White?

From 3.5 billion Reddit comments

Sorry. Your carbon filter.

Most inline carbon filters come with one. They range from a thin piece of cloth to a .5 inch of high porous foam.

If yours didn't come with one a piece of felt would work pretty well.

Or pick up something like this.

https://www.amazon.com/iPower-GLFILTPREFILT12L-Replacement-Prefilter-Carbon/dp/B07V31VTWL/ref=asc_df_B07V31VTWL/?tag=hyprod-20&linkCode=df0&hvadid=416786469837&hvpos=&hvnetw=g&hvrand=12935878471613540073&hvpone=&hvptwo=...