Home / Chemicals / Bioguard Lo-n-Slo Granular pH Decreaser Bioguard Lo-n-Slo Granular pH Decreaser Reduces pH and total alkalinity in pool and spa water. Easier and safer to use and store than Hydrochloric Acid Category: Chemicals Tag: Bioguard Spread the love Related products Bioguard Sparkle-Up Water Inhancer Read more Bioguard Oxysheen Fast Acting Non-Chlorine Shock Oxidizer Read more Bioguard MSA II Broad Spectrum Algaecide Read more Bioguard Salt-Cell Cleaner Scale build up remover Read more