Power Pak
Good product
CuLator Metal Remover for Pools & Spas removes heavy metals from swimming pool and spa water.
Patented CuLator PowerPak 1.0 is great for maintaining a metal-free pool. One CuLator PowerPak 1.0 removes and eliminates 1.0 ppm total dissolved stain-causing metals from 20,000 gallons of water.
The goal is to have 0.0 dissolved metals in your pool water. For best results keep a PowerPak 1.0 in your skimmer and change monthly to help prevent metal stains. The CuLator 1.0 lasts longer than a month depending on the metal level and the contents change color depending on the metal removed.