SpaGuard Spa Sentry 1 qt


In stock

  • Controls pH in one easy step
  • Establishes proper PH and prevents pH drift
  • Softens hot tub water by removing calcium
  • Enhances water clarity
SKU: 42638BIO Category:



Why go thru the hassle of lowering your pH and raising your pH when you can easily pour one-time and know that your water is balanced? Introducing the SpaGuard Spa Sentry into the spa water balancing family.

How does it work? Simply put:

  • Introduces a buffering compound, making pH easier to keep in balance
  • One easy step
  • Controls pH for up to two full months
  • Compatible with chlorine, bromine, ozone and biguanide sanitizers.

SpaGuard Spa Sentry is an easy, one-step liquid for maintaining a stable comfortable pH in your spa or hot tub. Bonus, it also softens your spas water. It makes balancing the water extremely simple, eliminating the need for many other water balancing treatments you may currently be using. Why not test with SpaGuard’s own test strips?

Be sure to check out how to balance your water!

*Please note: Spa Sentry should never be used in spas with plaster finishes or grouting that contains calcium.


Additional information

Weight 0.331 lbs
Dimensions 2.87 × 2.87 × 9.49 in

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SpaGuard Spa Sentry

SpaGuard Spa Sentry 1 qt

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