Keep your Caribbean pool pristine with the powerful Black Algae Killer 500gr by Curchem. This chlorine TCCA90-based formula packs a punch with 90% chlorine to tackle tough algae and bio-films. Its fine 3-15 mesh granules ensure thorough cleaning without harming your pool. Dive into crystal-clear waters without worries, as this chlorine is your go-to for top-notch water treatment.