As when there is a warranty claim, customers usually will contact me. So, from my experience more than 10 years selling both sand and membrane filters, sand filter is the most durable and least maintenance.

zeolite have been in market many years, mainly used by waterco, some OEM brands add in zeolite also nowadays. not a new tech.

micro z from perfect steel is finer than regular zeolite
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sample of zeolite from waterco
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"For many years the standard granular media used to reduce sediment were “multi media” combinations featuring such ingredients as garnet, anthracite, and sand. These mixed bed filters usually resulted in filtration down to 10 to 15 microns.

More recently, high purity zeolite has become the medium of choice for sediment filtration.  Modern zeolite filters achieve a 5µ nominal rating, with a couple of brands claiming to be even tighter.
There are some 40 known types of natural zeolites.  The most common is clinoptilolite.

Commercially, clinoptilolite is marketed for residential filtration under such brand names as ChemSorb, Micro Z, and Turbidex. It has a GRAS (Generally Recognized as Safe) classification and most brands have NSF Standard 61 certification to assure that they are adding nothing objectionable to the water."

http://www.purewatergazette.net/blog/zeoli...ctober-22-2016/