AquaClara Disc 4" Try our Aqua Clara Disc with improved porosity! Higher water flow means more ionizing action. Whether during operation, filtration cycles or heating cycles, this disc is constantly working as a super Ionizer. Works to keep your water free from bacteria and fungi. Fits in all spas with a floating weir. Gulf Coast Spas Cool Night Series, Shoreline Spas, Garden Leisure, Superior Spas, Hydro Spas, etc. Let the disc do all the work!