For those who keep aquatic crustaceans
The water conditioner Novaqua Plus removes iodine from water, according to their product page. Iodine/Iodide is an essential supplement for Crayfish, Crabs, and Shrimp that prevent bad moults that are often otherwise fatal. Iodine is also necessary in Marine systems for keeping corals, fish, and inverts healthy.
Novaqua is a useful, reliable Water Conditioner for Fish-only Freshwater and Brackish tanks, but please investigate using a different conditioner like Prime if you have a Marine tank or have crustaceans!