A high performing filter for your spa or hot tub. This threaded Rainbow spa filter features an engineered anti-microbial open flow core for better water circulation and dirt holding capacity. The design reduces the energy needed for filtration whilst also providing superior dirt loading and durability thanks to the highest fiber count. The anti microbial resin end-cap improves flow and lowers overall energy use. Best of all, it's easy to clean and comes in a range of sizes to suit different spa volumes.