FreshWater Vanishing Act XL Calcium Remover Type_Troubleshoot Plenty of cartridges share a

Plenty of cartridges share a 50 sq ft rating but differ in diameter

and UV inhibitor formulated for spa and hot tub covers — and for any other marine-grade vinyl surface that lives outdoors

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FreshWater Vanishing Act XL Calcium Remover Type_Troubleshoot Plenty of cartridges share aThe FreshWater Vanishing Act XL Calcium Remover is the heavy duty version of the standard Vanishing Act, designed for spa owners filling from genuinely hard water sources. With three times the calcium binding capacity of the standard size, the XL handles fill water above 150 ppm in a single 72 hour treatment situations where a standard Vanishing Act would need multiple consecutive applications or simply wouldn't keep up. If you've measured your fill