Product Fact Sheet: BioGuard Lo’N’Slo

Product Features:

  • Minimum 93% w/w granular sodium hydrogen sulfate (sodium bisulfate).
  • Effectively and gradually lowers pH and Total Alkalinity.
  • Easy to use.
  • For use in all pool types.


  • Safer to use than liquid acid (hydrochloric acid, muriatic acid).
  • Easily measured.

Application Instructions:

  1. Balance Total Alkalinity to 80 – 125 ppm for concrete and tiled pools, or to 125 – 150 ppm for other surfaces.
  2. If pH is above 7.6, apply Lo’N’Slo as determined by the acid demand chart in test kit.
  3. Apply by broadcasting product evenly across the pool with the pump running.
  4. Circulate for 2 hours and retest pH.

Product Notes:

  • Never add more than 250 grams of Lo’N’Slo per 10,000 litres at one time.
  • New concrete or tiled pools may require frequent treatments for the first few weeks.
  • Do not add near metal fittings nor allow pH to drop below 7.2.
  • Do not allow undissolved lumps to remain on the pool bottom. Break up with brush.

Available Sizes:

  • 1.5-kg bags
  • 1.5-kg bottles
  • 10-kg pail
  • 5-kg bags

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.