SpaGuard Calcium Increaser Tub Water Hardener

SpaGuard Calcium Increaser is a spa water hardener for cold plunges and hot tubs. It raises low calcium hardness toward the balanced range that protects surfaces and equipment.

Dose to the water as directed for your tub volume, then recheck hardness before soaking. Stored sealed in a dry place, it fits a regular water-care routine.