PDS Parker Bailey Descaling Tablets Made in Maine, USA by Parker & Bailey, manufacturers since 1879 Easy to use, no mixing or measuring. Just fill with clean water, add one descaling tablet, let tablet dissolve and cycle through coffee machine until reservoir is empty Removes lime scale build-up and bacteria Improves the performance of your coffee maker and the taste of your coffee Use monthly for best results Works well on electric jugs and makes the jug boil more quietly Pack contains four descaling tablets