Pentair Colorcascade® 590048 LED Bubbler Replacement Accessory Kit. The ColorCascade Bubbler is a vivid mix of color-changing LED lighting and fountain-like water movement. It is the perfect way to showcase and enhance pool features like sun shelves, steps, beach entries and poolscape elements like ponds and fountains. Its low voltage and minimal water flow requirements make them an ideal, energy-efficient addition to pools, fountains, ponds and more.