The 3 Hydros Multi Filter (1 sealed box and 1 extra filter) Replacements Water Fast-Flow are water filters designed to fit all Hydros vessels. Made of plastic, these filters use carbon/charcoal filtration method to remove chlorine taste and odor, making them suitable for household use. The product is manufactured in the United States by the brand Hydros, ensuring quality and compatibility with Hydros vessels. With a fast-flow design, these multi filter replacements provide clean and refreshing water for your convenience in the kitchen or dining area.