PoolRx proprietary blend of minerals kills algae and bacteria continuously and effectively for up to 6 months, with at least 0.5 - 1.0 ppm of chlorine. Through this process, the PoolRx minerals allow chlorine to last longer in the water, therefore reducing the amount of chlorine that is needed to reach and maintain the desired parts per million (ppm) target. The minerals are packed in a specially treated alloy cylinder that is pool size specific and chelated at a molecular level to prevent staining.