High strength, Chlorine Tablets complete with Algaecide and Clarifier for total hot tub and pool care. CleverSpa Multifunction Tablets are a popular method of sanitization. When used in conjunction with our CleverSpa 5 Chemical Dispenser, the multifunctional tablets trickle-feed chlorine into your hot tub water over a period of days. Your CleverSpa hot tub needs to be chlorinated at all times. The ideal chlorine level is between 3 parts per million (ppm) and 5ppm.