Pool Basics 3" Multi-Purpose Chlorine Tablets contain a proprietary blend of ingredients that will reduce the amount of pool chemicals needed to keep your swimming pool crystal clear. These tablets offer you more than a sanitizer... These 3" chlorine tablets also contain a clarifier, a stain and algae preventer and a de-scaler to help keep your swimming pool in top-notch condition. They are individually-wrapped for convenience, ease of use, and product purity plus packaged in Lite Latch container with senior-friendly, child-resistant lids. Pool Basics Multi-Purpose Chlorine Tablets are great for floating chlorinators or automatic chlorine feeders.