Tetrafauna ReptoGuard Turtle Health Conditioner Block, 1-Count Tetra Fauna offers a conditioner block that will treat and make the water safe for aquatic turtles, amphibians and other reptiles. The Tetra Fauna ReptoGuard Conditioner Blocks are medicated sulfa blocks that treat water in turtle tanks and amphibious terrariums. The blocks are time released to help safely control and condition the water in your tank. Helping to fight disease causing organisms such as salmonella the blocks help to ensure that your aquatic pet is safe, disease free and overall healthy. Each turtle shaped block treats up to 20 gallons of water and lasts between 45 and 60 days. To use the product first use one ReptoGuard Turtle Conditioner per 20 gallons of water. The Blocks will slowly dissolve and release the active ingredients. Replace when you feel is necessary, each turtle block lasts on average 45 days. Keep your turtle, amphibian or reptile safe and healthy with the TetraFauna ReptoGuard Conditioner Blocks.