The faucet filter is not intended to purify water. Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the system. Systems that are certified for cyst reduction may be used on disinfected water that may contain filterable cysts. Individuals requiring water of specific microbiological purity should consult their physician. Do not use with water above 100°F/38°C as this may damage the filter. Use with cold water only. After each new filter cartridge is installed, run the water 5 minutes to flush it. Then, prior to each use, run water through the filter for 5 seconds to activate the filter. Clean the exterior of the faucet filter housing with a damp sponge or soft cloth. A mild dishwashing liquid may be used. Using anything else to clean your faucet mount could result in damage to the unit.