I am looking for 1 micron filters. Why are these so much cheaper than other brands in my hardware store? What's the catch?

The reason that these are so inexpensive is that the rating is 1 micron NOMINAL. It does not state this in the ad, but when you receive that filters, it is clearly stated on the label (but not on the online label). Here is the definition for clarity: Absolute: Filter Rating meaning 99.9% of the particles larger than a specified micron rating will be trapped on or within the filter. Nominal: Filter Rating indicating the approximate size particle, the majority of which will not pass through the filter. If you want Absolute rating, you will pay $75 or more for a single filter. I use these filter to clarify home made wine and they are perfect for that.

Where are these filters made please ?

on the main water pipe. But besides the filter , it has a dedicated device that comes that you need to install

Is this filter really 1 micron?

Yes, this filter seems to catch particles down to 1 micron. We have very fine black sand particles in our water. The 5 micron filter lets some through, but the 1 micron is very effective.

What is the efficiency of these filters? I don't see a rating which makes me believe they're bad (which coincides with my experience with them).

My implementation may not be common. I use these to filter collected rainwater for my chicken drinking nipples. They are rated at 1 micron which is more than sufficient for my needs, i.e., particulates that may get past "first flush" in the collectors. Since I use a gravity feed flow, they are not under pressure. Per the description, they last 20K-60K gallons but that is very dependent on the quality of water. Typically, these type of filter is only 1 stage of a multi-stage filtration system, i.e., it is essentially the pre-filter.

ASIN	B01M0MIPUE
Best Sellers Rank	#166,132 in Kitchen ( See Top 100 in Kitchen ) #474 in Water Filter Cartridges
Brand	aquaboon
Brand Name	aquaboon
Compatible Water Purifier Models	3M AP101T
Customer Reviews	4.7 out of 5 stars 1,628 Reviews
External Testing Certification	NSF
External testing certification	NSF
Global Trade Identification Number	00850015007620
Included Components	Replacement Water Filter Cartridge
Item Dimensions D x W x H	25.6D x 36.6W x 6.1H centimeters
Manufacturer	AQUABOON
Material	Polypropylene (PP)
Material Type	Polypropylene (PP)
Model Number	AB-S1M
Product Benefits	Removes contaminants, improves water clarity and taste, ensures uninterrupted water flow, and is universally compatible with various systems
Product benefits	Removes contaminants, improves water clarity and taste, ensures uninterrupted water flow, and is universally compatible with various systems Product benefits Removes contaminants, improves water clarity and taste, ensures uninterrupted water flow, and is universally compatible with various systems See more
Product dimensions	25.6D x 36.6W x 6.1H centimeters
UPC	850015007620
Unit Count	6.0 Count

Aquaboon 1 Micron Whole House Sediment Filter 10 x 2.5 for RO & Well Water Filters Replacement Cartridges Compatible with AP110, WHKF-GD05, 6 Pack

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