• Special Quartz Glass • Improved Version • More Efficient • More Compact • Internal Ballast Aqua Zonic Submersible UV Lamp G2-i is specially made for underwater sterilization needs and comes in different sizes to suit all purposes. Made with high quality material and total waterproofed, this product is well-designed, low maintenance, reliable and can be used for extended period of time. UV tube is replaceable as well when the need arises.