Spa Balancers: Testing and balancing your spa water is an essential part of maintaining a hot tub. You can raise or lower your pH easily with Spa pH Increaser or Spa pH Decreaser. Spa Calcium helps prevent corrosion of equipment and etching of spa surfaces. Spa Alkalinity provides spa owners an effective way to raise spa alkalinity, which stabilizes a spa pH level. Maintaining a stable pH level minimizes swimmer skin and eye irritation, helps improve water clarity, and prevents costly equipment damage from corrosion or scaling.