E-Z CLOR® Metal Identification Tags are the most cost-effective and simplest way to detect the presence of stain-causing metals in pools & spas. Keep a tag attached to the pool or spa skimmer basket until it changes color, indicating when metals are present and action is needed. Identifies the presence of copper, iron, cobalt and nickel.
 
Features
Connect the Metal Identification Tag to the skimmer basket.
After a few days, hold the Tag up to the sunlight and look for a color change.
Any color will indicate if metals are present.
Use the color chart to identify the stain-causing metal.