text: * Alkalinity
  * Biochemical oxygen demand (BOD)
  * Chemical oxygen demand (COD)
  * Dissolved oxygen (DO)
  * Total hardness (TH)
  * Heavy metals
  * Nitrate
  * Orthophosphates
  * pH
  * Pesticides
  * Residual sodium carbonate index (RSC)
  * Sodium adsorption ratio (SAR)
  * Surfactants