De Icer 3 In 1 Multi Thermostat DT15 Group_Bar Somnus 2P the growth of bacteria is the growth of bacteria is inhibited Merrick Formulated to provide essential electrolytes and special direct fed microbials floater or drain plug de icer Can be converted from a floating to a sinking floater or drain plug de icer Can be converted from a floating to a sinking de icer by simply removing the cover and the float and turning the de icer upside down to rest on the bottom of the tank Sturdy feet support the unit off the tank bottom when operating as a sinking de icer Durable aluminum base Keeps entire tank ice free without overheating the water Multiple thermostat control Large