PureCool is the Water Filter designed for use with almost any open-top Water Cooler and ALL standard ceramic water crocks. Fits either 3 or 5 gallon water bottles. Each PureCool filters 140 -300 gallons (chloramine/chlorine).   PureCool lets you "Make Your Own Bottled Water" at a savings of up to 95%! Using PureCool instead of Bottled water saves millions of gallons of fossil fuels, saves tons of carbon emmissions from spewing into the air, and plastics from ending up in landfills. PureCool removes chlorine, chloramine, lead and heavy metals, mold, algea, bad tastes and odors. NSF certified and Made in the USA. *Rarely needed: If the opening above the reservoir of your water cooler is wider than 6 1/4" you will need a PureCool Adapter Ring to allow your PureCool to fit properly. Just let us know and we'll include one in your first order. Works for cooler opening up to 7 1/8" wide. Reusable for years. *Opening in top of water cooler must be at least 4 5/8" wide. PureCool is 4 1/2" wide at the bottom.