The UVMAX IHS12-D4 combines pre-treatment filters with UV purification to provide a system that combats microorganisms, odors, color and particles commonly found in water. As a point-of-entry unit, the IHS12-D4 is capable of supplying water for small homes at 9 GPM. For the current rebranded version, please see the VIQUA IHS12-D4 or the VIQUA IHS22-D4 for a larger primary filter. Both the VIQUA IHS12-D4 and the VIQUA IHS22-D4 have been upgraded to a 12 GPM capacity. *UVMax IHS12-D4 has been upgraded to the VIQUA IHS12-D4 or VIQUA IHS22-D4. Replacement parts available below.