STICKS COMPARE TO BIOGUARD, SUN, GUARDEX, AND PACE. Powerful 90% Available Chlorine! These extra-large 8 oz. sticks are very slow dissolving, requiring less maintenance. Each stick measures approximately 2-1/4" x 2" diameter. Use in your floater, automatic chlorinator, or skimmer basket. 99% Trichloro-S-Triazinetrione.