Alpine Pure powered 18 US Gal Per Minute UV with Three 10 inch Big Blue Heavy Duty NSF Approved housings. One inch ports for a full flow of up to 60 LPM. Fully assembled with 304 New Zealand Made Stainless Steel brackets and water proof cover so this unit can be installed out in the rain. 40 Watt High Output lamp for large water flow and low energy costs. Genuine Gradient Density NSF Approved Granulated Activated Carbon plus 20 micron and 1 micron prefilters installed as standard. We manufacture this system as standard with a right hand side water entry but we can assemble it with water entering from the left hand side if requested.