ZeroWaterReplacement Filter for Pitchers, ZR-600 by ZeroWater

Why is our product with a new filter, registering 164 ppm?

Do they have zero water etched on them or are they from a different company

Do they have an expiration date on them?

Descriptions slightly confusing considering the price. How many filters are included for $116? 12 filters or 6 filters? If 6, why higher priced?