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The PoolRx Black Spa Unit - 400-1000 - Original (101055) is packed with a unique blend of minerals that eradicate algae and provide constant long-term protection. Its specially treated alloy cylinder ensures the timely dissolution of our mineral formulation—PoolRX+—into your spa water to form a residual barrier against future contamination. Simultaneously, it liberates low levels of chlorine molecules to be more efficient in sanitizing your water! Working together with small amounts of chlorine, the freshly released minerals can help you keep bacteria at bay while providing unbeatable coverage.