How long do they last in the shower before being replaced??

How long they last will depend on your water system if it's filtered before it come to your shower head or not. Otherwise you will know when it's time to change filters it changes color when it get full and your shower head won't produce as much flow as before.

What micron is this? 0.2 micron? Does it have beads inside?

No beads inside. It's just pleats of cotton. If you do need these for a shower head, make sure they are the right length. Some use these 3.7" length Some use 3.5"/ 4"

ASIN	B09P9TR3VS
Best Sellers Rank	#70,799 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #668 in Handheld Showers
Brand	luzdiosa
Brand Name	luzdiosa
Customer Reviews	4.4 out of 5 stars 1,167 Reviews
External Testing Certification	NSF
External testing certification	NSF
Item Dimensions D x W x H	23D x 23W x 94H millimeters
Item Weight	0.08 Kilograms
Item weight	0.08 Kilograms
Manufacturer	Amwing
Material	Plastic
Material Type	Plastic
Model Number	LZD-VORTEX-PP-COTTON-12
Product Benefits	Improves water quality for showers
Product benefits	Improves water quality for showers
Product dimensions	23D x 23W x 94H millimeters
Unit Count	12.0 Count

Vortex Shower Head PP-Cotton Filter Cartridge 3.7in Set of 12 Replacement Filter Cartridge for Detachable Propeller Hydro Shower Jet Sets

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