Sustain® Pool Care Guide. Pool Care Basics Water Testing Chemical Overview Maintaining FAC & pH Maintaining Balance Circulation & Filtration Pool Stabilizer How to Shock a Pool Algaecide Vinyl Pool Liners Troubleshooting Algae Low Free Chlorine High Free Chlorine Cloudy Water Colored Water Increase in Filter Back Pressure Spots & Stains Eye & Skin Irritation/Strong Chlorine Odor Corrosion & Surface Etching Safety Tips Pool Safety Chemical Safety Glossary