SplashTech Large Floating Chlorine Dispenser for 3-inch Tablets Safely and conveniently diffuses 3-inch chemical tablets into your pool water Large size is ideal for 5,000-gallon pools. Small pool or spa? Try our Mini dispenser! Play-proof! Locking lid keeps the chemical tablets securely inside, so splash all you like No care required. Just fill with your choice of chemical and let it float while you enjoy your pool Choose the best size for your pool. Our large diffuser is 8.5" tall with an 8.5" diameter