HTH Pool Care Tablet Skimmer Tabs 9 lb, Pack of 2Give your swimming pool water a visibly brilliant sparkle with this convenient and easy to use Cal Hypo formula. Destroys bacteria and controls algae. Use in skimmer. Lasts up to one week. Visibly brilliant sparkle This Cal Hypo based formula sanitizes without adding cyanuric acid (CYA) to prevent overstabilizaiton or chlorine lock. Slow dissolving, long lasting The patented HTH slow dissolving technology protects against chlorine loss in direct