TetraFauna ReptoGuard Turtle Health Conditioner is a slow-dissolving conditioner that helps to support the health of aquatic turtles, as well as amphibians and other reptiles. Each slow-release, medicated sulfa block treats up to 20 gallons of water and lasts up to 2 months. Each block of TetraFauna ReptoGuard Turtle Health Conditioner will slowly dissolve, releasing the active ingredients continuously for up to 60 days. For pet use only - not intended for animals that will be used for human consumption. Use this conditioner with TetraFauna AquaSafe For Reptiles & Amphibians, which neutralizes harmful chlorine, chloramines and heavy metals such as copper, iron and zinc, in tap water and contains colloids that protect turtle skin.