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Product Features:

  • Granular sodium hydrogen sulfate (sodium bisulfate).

  • Slowly lowers pH.

  • Helps prevent scale build-up, cloudy water and eye irritation.

  • Safer than liquid acid (hydrochloric acid, muriatic acid).


  • Protects spa and equipment.

Application Instructions:

  1. If pH rises above 7.6, add Lo'N'Slo with circulation running and aeration off.

  2. Determine amount by performing an acid demand test in a BioGuard test kit or see the approximate dosage chart below.

  3. If controlling the pH is a continual problem, test for total alkalinity and adjust as necessary or use Perfect Balance.


7.6 - 7.8

7.8 - 8.0

8.0 - 8.4

Above 8.4

Lo'N'Slo per 1,000 litres

0.5 tsp.

0.75 tsp.

1.5 tsp.

2 tsp.

Available Sizes:

  • 750-gram bottles

NOTE: Avoid physical contact with product. Follow safety information on label Instructions. Store in a cool, dry place. Keep out of the reach of children.