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Reduce your swimming pool's chlorine level quickly with Jack's Magic® After Shock™. After Shock™ is designed to work in conjunction with Stain Solution #1 for removal of iron, cobalt, and spot-etching stains from pool surfaces without having to drain your pool.
If your stains are the result of high copper levels, utilize the After Shock™ with Stain Solution#2. After Shock™ will help reduce your swimming pool's chlorine level to below 1 ppm.
Directions for Use:
NOTE: Overdosing will make establishing a chlorine residual difficult following treatment. It is best to use smaller amounts with repeated additions.