AquaChek Yellow Chlorine

AquaChek Yellow is the weekly 4-in-1 test for chlorine hot tubs — one strip, one dip, and you've read the four numbers that matter:

• Free chlorine — is the sanitizer actually at a safe, effective level?
• pH — keeping water in the 7.2–7.6 band that protects your equipment and your eyes
• Total alkalinity — the buffer that stops pH from bouncing around
• Stabilizer (cyanuric acid) — confirms your chlorine is protected from rapid breakdown

How to use it: dip a strip for one second, hold it level without shaking, wait 15 seconds, and compare the pads to the colour chart on the bottle. Test once or twice a week, and always after a party-level bather load.

Works with: any chlorine-sanitized spa — including Arctic Spas salt water systems (Onzen and Spa Boy generate their sanitizer from Onzen Sea Salt, so a chlorine strip is exactly the right check), and spas dosed with Spa Tabs or Boost.

50 strips per pack.