The E4 Model is a 22 GPM point-of-entry system for medium to high flow applications that renders chlorine-resistant parasites, bacteria and viruses harmless. This system features an EOL timer that tells you when to replace the lamp, an LED status monitor to track system functionality and stainless steel chamber. For the current rebranded version, please see the VIQUA E4. *UVMax E4 has been renamed VIQUA E4. Replacement parts available below.