Proof Grade Wood

A pre-filter is an activated carbon sheet or similar that you stick at the top of your filter so that any big particles/residue get stuck on that first, before going through the way more expensive and fine :glowforge: filter cartridge. You will have to replace them much more often, but they’re like $20 for a 4 pack so the cost is WAY less than the $250 actual filter.

Something like this (you may have to cut to fit): https://www.amazon.com/Breathe-Naturally-Replacement-Honeywell-Purifier/dp/B06Y5HMKBP

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That is GREAT information! Buying those now! Hopefully these will extend the life of my GF filter because spend almost $300 every couple few months is not in my buget.
Thank you Thank you Thank you!!!

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