BAir-O-Swiss AOS 7417 EZ Cal - CleanerDescaler - 3 pack ReviewbP PP Air-O-Swiss AOS 7417 EZ Cal - CleanerDescaler - 3 pack PSimple and safe to use - EZCal ensures a clean humidifier and continuous high performance.POne box includes 3 individual packetsPuse just one packet per cleaning.PFor best results use EZCal every two weeks depending on the water hardness.PEZCal is safe to use on other humidifier brands.