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A must for every pool owner! These revolutionary and easy to use stain removers eliminate most types of stains and deposits including: rust, calcium scale, or calcium deposits without using extra chemicals to treat problems your pool doesnt have. Simply choose which stain is causing problems, or in the case of rust, which surface the stain is on. Since extra chemicals mean extra headaches when it comes to pool chemistry, each pen is designed to treat one stain, on a specific surface. These pens are soft and will not scratch or gouge (when using proper eraser on appropriate surface). Use by hand or attach to any standard telepole.