Review on Replacement Sub Micron Post Filter Filter Systems by Joseph Katipally

I have 6 years / 6 million gallons. Khan's system using this as a post filter. I spent $30 on a cartridge and doubted I could get 4 cartridges of the same quality for the price of one. Well I cut open the old one (which was really gross) and it turned out to be the same material, same thickness as this one. The only difference is the plastic mesh covering the brand name, but I'm not sure how that affects performance. I will tell you in 6 months when I will replace the one just installed. If something is wrong, I will update this review. But for now I'll give them the benefit of the doubt by rating it 5*****.