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 all week with zero hassle!

UV SHIELDED FORMULA - Built-in cyanuric acid stabilizes chlorine, protecting it from sunlight degradation for longer-lasting freshness.
VERSATILE COMPATIBILITY - Perfectly designed for above ground or inground pools, compatible with feeders, skimmers, and automatic chlorinators.
ULTRA CONCENTRATED POWER - 99% Trichloro-S-Triazinetrione delivers maximum sanitizing strength for crystal-clear pools.
EFFORTLESS WEEKLY MAINTENANCE - Slow dissolving tablets ensure consistent chlorine levels with just one dose per week.
INDIVIDUALLY WRAPPED CONVENIENCE - Each tablet is sealed to preserve potency and simplify handling—no mess, no waste.

C3 3" Stabilized Chlorine Tablets offer a premium 99% pure chlorine formula combined with cyanuric acid for UV protection. These slow-dissolving, individually wrapped tablets provide reliable, once-a-week dosing to maintain clean, sparkling water in both above ground and inground pools. Packaged in a 25 lb bucket, they are ideal for use in feeders, skimmers, and automatic chlorinators, ensuring effortless pool care and long-lasting sanitation.

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