3 inch Wrapped Trichlor Tablets. Trichlor (Trichloroisocyanuric acid) is the strongest compressed chlorine and provides 90% available chlorine. Great for a prolonged and steady feed of chlorine to maintain a chlorine residual. Trichlor is stabilized to protect the chlorine from the ultraviolet rays of the sun. This prolongs the life of the chlorine and gives you a healthy swimming environment and cost you less to maintain the proper chlorine residual. 1" tablets expose more surface area per pound than 3" tabs or sticks for the fastest dissolution rate. Trichlor has a lower pH than many forms of chlorine and may reduce the amount of acid used.