Balboa Purezone P3 Refill Cassette 3 Pack - 48 Tests / 60 Days

Replacement triple pack of Balboa Purezone P3 test cassettes

Balboa Purezone Hover or Purezone Dock required, available separately 

Each P3 cassette contains 48 tests, and lasts up to 60 days in water. 
ie Each 3 pack of cassettes covers you for 180 Days / 6 Months of testing 
Approx $0.93 per day to operate

Each test measures:
pH 
Free Chlorine (FC) or Total Bromine (TB) 
Total Alkalinity (TA) 

NB - do not remove the Purezone from the spa for any length of time. The cassette will lose its ability to test if dried out.