Trichlor tablets provide constant and effective chlorination, ease of handling, and indefinite shelf life. 90% Available Chlorine - The highest content you can buy! The most trusted name in keeping your water sanitized! No binders fillers or lubricants - use in automatic chlorinators or floaters to destroy bacteria and keep your pool algae free. Dosage: 1 per week.Leslie's Power Powder Plus will quickly get the job done so you can return to the water. Power Powder Plus is the fastest dissolving shock on the market, ensuring a quick shock and preventing the chance of particle staining. The shock is comprised of 73% chlorine to handle the toughest of bacteria and algae for a sparkling clean pool. Dosage: 1 lb per 16,500 gallons.