Aquasana water filters are required to document the purity of the water they produce. This strict regulation allows consumers to accurately compare the performance.

The most stringent tests have been performed on the Aquasana products in California, USA. California has the strictest requirements in the States, with manufacturers required to have all promotional, advertising, websites and packaging materials reviewed by the Department Of Health for accuracy prior to certification.

The California Certification is one of the best ways to determine a product's performance capabilities.

Aquasana 4000 Countertop Water Filter

Certifications and Performance Data Sheets

Certificate of the Department of Health Services, California, USA, confirming that the AQ-4000 water filter has 'met the testing requirements pursuant to Section 116830 of the Health and Safety Code'.

Certified performance data sheet confirming that the AQ-4000 complies with NSF Standards 42 and 53, and is certified by the California Department of Health Services Drinking Water Treatment Device Program.

Report from Underwriters Laboratories Inc. that the AQ-4000 reduces chlorine by 99% for a full 500 gallons.

Report from Underwriters Laboratories Inc. that the AQ-4000 complies with ANSI/NSF Standards 42 and 53 - structural integrity.