Support Common Questions Common Questions Common Drinking Water Contaminants While certain water contaminants, like iron, sulfur, and total dissolved solids, are easy to spot by residue, odor, and discolored water, other potentially harmful contaminants, like arsenic and lead, can go undetected by the senses. Learn about common water contaminants Your Culligan Water Delivery Service Questions, Answered Learn more about Culligan Water’s convenient delivery service and enjoy cleaner, better-tasting water whenever you need it most. Learn about Culligan’s Water Delivery Service What are PFAS, PFOA, and PFOS? Perfluoroalkyl and polyfluoroalkyl substances (PFAS) are a group of man-made chemicals that include Perfluorooctane Sulfonate (PFOS) and Perfluorooctanoic Acid (PFOA). These elements have a negative effect on the health of those exposed to them. Learn more about Chemical Water Contamination What is Reverse Osmosis? Quickly find answers to some of our most-asked questions about Reverse Osmosis. Learn about Reverse Osmosis What is a Water Softener? Quickly find answers to some of our most-asked questions about Water Softeners. Learn about Water Softeners Culligan Water Lab Test Kits The Essential and Comprehensive Water Lab Test Kits provide a fun, interactive way to immediately understand the quality of the water through graphs and charts. Learn more about Culligan Water Lab Test Kits Culligan 100% Satisfaction Guarantee If you are dissatisfied with your Culligan product for any reason within 30 days of your purchase, Culligan will remove the product and refund the purchase price.* About Culligan Culligan International History Awards News Corporate Responsibility Our COVID-19 Response Work with us Careers Franchising Contact 1-877-541-0382 Contact Us Culligan Worldwide © 2021 Culligan | Terms and Conditions | Privacy | Sitemap *Applies to Culligan-branded standard household equipment only. Zip Water and HANS by Culligan products are excluded. Dealer participation may vary. Live chat: Chat with us