**NEW DESIGN - (1) Piece ALL-IN-ONE FILTER** Field Controls part number 1RK005. Compatible with the Sun-Pure SP-20, SP-20C, Trio-1000 and Trio-1000P. Kit includes (2) filters and (1) UV light. The Field Controls/Sun-Pure 1RK005 includes multi-stage filtration and PRO-Cell Technology odor and VOC reduction. The filters include four stages of filtration to ensure your air is clean. The pre-filter collects particles as small as 5.0 microns*, while two layers of charcoal activated filters remove odors and smoke. The final stage of filtration is a High Efficiency filter that traps tiny microscopic particles as small as 0.3 microns such as dust, dander, and pollen. Bacteria, viruses, mold, and fungi are neutralized by a high output UVC germicidal lamp, and the patented PRO-Cell honeycomb grid magnifies the power of the UV lamp to transform odors, smoke, and volatile organic compounds (VOCs) into fresh healthy air. The Field Controls/Sun-Pure Healthy Home System products do not generate ozone like many other products. The fact is, Field Controls/Sun-Pure germicidal lamps convert ozone back into safe, healthy oxygen. Ozone is a toxic gas which can damage the lungs when inhaled. Even low amounts can cause chest pain, coughing, shortness of breath, and throat irritation. Ozone may also worsen chronic respiratory diseases such as asthma and compromise the ability of the body to fight respiratory infections. Kit includes (1) prefilter, (1) HEPA filter and (1) UV lamp. PLEASE NOTE: The new UV lamps need to be replaced only once per year now. If you have an older model purifier, please disregards the change light. Simply replace the lamp when you replace your filters once a year (or more often if in a polluted environment. EPA Establishment Number 59662-CA-001.