CuLator Metal Eliminator Power Pak 1.0 Metal Eliminator and Stain Preventer down to 1 ppm total dissolved metals in 20,000 gallons of pool water. CuLator PowerPak 1.0 is great for maintaining a metal-free pool. Each PowerPak removes and eliminates 1.0 ppm total dissolved metals from 20,000 gallons. For best results keep a PowerPak 1.0 in your skimmer and change monthly to help prevent metal stains.