Protect your hot tub or spa investment from mineral damage and dull water with Sirona Spa Care Protect Plus. This liquid formula sequesters suspended iron, copper, and calcium minerals to prevent metal staining on spa shells and calcium scale buildup inside heaters, jets, and plumbing lines. Formulated with an integrated organic water clarifier, it binds micro-particulates together for rapid removal by your spa filter, keeping hot tub water crystal clear.