Poolmaster Brand Smart Test Series 4-Way Combo Pool And Spa Test Strips, 50 Count (MPN: 22211) *Packaging Graphics May Vary*
Chlorine and Bromine are sanitizers that help keep the pool and spa water free from germs and algae build up. Testing for these will indicate the active amount of these sanitizers in the water.
Alkalinity and pH measure the amount of acidity in the pool and spa water. Maintaining a proper balance of Alkalinity and pH will help keep the water from developing scale or cause corrosion.