water

• distilled water

  boiled, condensed

  • remove ions (chemical impurity -> false report)
• water

  beneficial - dissolved oxygen, metal compound - essential minerals

  harm - toxic lead compound, plastic, sweage (microbe, disease), nitrate + phosphate deoxygenate water

  • treat: filter large debris -> sedimentation: fine particles clump, settle -> carbon filter remove odor, taste -> chlorination, bubble gas, kill bacteria