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With the PoolRx Yellow/White Spa Mineral Unit - 100-400 Gal (331057), you'll be able to permanently eradicate algae. This ingenious unit consists of a specially treated alloy cylinder that contains a special combination of minerals, known as Pool Rx plus mineral formulation. As soon as these minerals dissolve inside the cylinder, they create an encompassing residual throughout your spa water and eliminate any lingering algae while simultaneously allowing low levels of chlorine to become more active and effective in the pool area.
Directions for use: