The Pressure-Flo Service Kits contain everything needed to perform maintenance on a Pressure-Flo unit. The high quality filter foam media provides complete mechanical filtration. The kit also includes a UV-C lamp which creates beneficial pond water conditions for fish and plants. The super absorbent foams and UV-C lamp are custom designed to fit inside the Laguna Pressure-Flo Filters. This service kit is ideal for the sring season.