Potable Aqua Water Purification tablets with PAPlus lead the way in making small quantities of even the most bacteriologically questionable water suitable to drink. Iodine based water purification tablets and PAPlus neutralizing tablets. Wipes out bacteria and other micro organisms such as viruses and protozoa found in unsafe water. Proven effective against Giardia Lamblia when use as directed. PAPlus removes the iodine taste and color from water treated with Potable Aqua. For short term or limited emergency use only. Great for backpacking, camping, hiking, travel, and emergencies. Approved by the U.S. Environmental Protection Agency. Treats up to 25 quarts.