How long do the filters last in AquaTru countertop purifiers?

For our AquaTru Countertop purifiers (Classic and Classic Smart versions) have the following filter lives:

Pre-Filter: 6 months or 600 gallons, whichever comes first

RO Filter: 2 years or 1200 gallons, whichever comes first

VOC Filter and pH + Mineral Boost VOC Alkaline Filter: 1 year or 600 gallons, whichever comes first

For our AquaTru Carafe purifiers have the following filter lives:

AquaTru Carafe Pre-Filter: 6 months or 300 gallons

AquaTru Carafe Reverse Osmosis Filter: 2 years or 600 gallons

AquaTru Carafe VOC Carbon Filter: 1 year or 300 gallons