New to air pumps

It depends on how much air you need each time and the general humidity where you are filling. In a dry area and only topping off guns you could probably get by with the small cotton filled ones. For bigger tanks and lots of air look here to get an idea.
https://www.airgunnation.com/threads/tuxing-dual-filter.1301104/
A few use only the second filter with the silica gel and molecular Sieve. Similar to:
 
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Ed,
RC4fun linked to a helpful thread, they say a picture is worth a thousand words, here's my (Florida) Yong Heng set-up. Copper-colored filter by back wall is water-coalescing, long gold is M50 molecular sieve, black/blue smaller ones, cotton-filled. Didn't start out with water-coalescing filter but black cotton-filled one got soaked, clean and dry since. WM
IMG_20220322_203924.jpg
 
The GX-CS3-I is on sale at GX Pumps for the same price as the GX-CS3, the only difference is the AC Power Supply is internal, so you don't have an external power supply sitting on your counter.


Also, if you use Discount Code GX10OFF, you can get another 10% off.