CuLator is a powder chelator conveniently packaged in individual flow-through bags. Place a CuLator bag in your pool or spa skimmer and after one month, remove the used, biodegradable CuLator bag and throw it away with regular household trash. Replace with a fresh CuLator bag to keep your pool or spa metal-free. CuLator will rid of Copper, Iron, Manganese, Cobalt, Nickel, and Silver. CuLator is available in a 1.5PPM package and a 4.0PPM package. One package treats up to 75,000L of water.