What is the available chlorine? Please list the ingredient percentages..

Up to 89% chlorine is available from these slow dissolving tablets.

Any idea how I get the container open? I've tried pushing where it says "push" and turning, but it doesn't work...

The lid is not easy to open you might try using a utility knife to cut the tab that says push but be careful and always cut away from your body and keep your hands and fingers away from the path of the knife blade

Link to C3 storefront displays a sunglass retailler of the same name. I would tread cautiously the price may be too good?

C3 is the Chinese manufacturer, not the USA retailer.

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💧 Keep your pool sparkling with science-backed ease!

UV SHIELDED CHLORINE - Built-in cyanuric acid stabilizes chlorine, protecting it from sunlight degradation.
VERSATILE COMPATIBILITY - Perfectly sized for feeders, skimmers, and automatic chlorinators—pool care made seamless.
ULTRA CONCENTRATED PURITY - Harness 99% Trichloro-S-Triazinetrione for maximum sanitation power.
EFFORTLESS WEEKLY MAINTENANCE - Slow dissolving tablets mean you dose just once a week—set it and forget it.
INDIVIDUALLY WRAPPED CONVENIENCE - Each tablet is sealed to preserve potency and simplify handling.

C3 3" Stabilized Chlorine Tablets deliver 99% pure, slow-dissolving chlorine with built-in UV stabilizer for consistent weekly pool sanitation. Individually wrapped for freshness and compatible with all standard chlorinators, these 25 lbs tablets ensure crystal-clear, protected water with minimal effort.

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