TWC 4.08 – Recap and Glossary

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Recap and Glossary

  • Prefiltration is accomplished by installing a filter cartridge made of HDPE microfibers and/or an activated charcoal filter.
  • HDPE microfibers can remove undissolved solids.
  • Activated charcoal removes chemicals. It also removes odours produced by chemicals such as chlorine and chloramine.
  • Reverse osmosis systems blend two waters: water that has been filtered through activated charcoal, and product water that travels both through the charcoal and the osmosis membrane.
  • Osmosis membranes produce product water at or around 10 ppm.
  • The osmosis membrane allows H2O molecules to travel through, but it is too fine to allow ions that are bonded to various H2O molecules to travel through the pores in the membrane.
  • Ion-exchange resins are usually charged with sodium cations that will attract calcium and magnesium cations in the water, with the effect of removing hardness from the water.
  • Remineralisation requires you to use a readily soluble mineral salt such as magnesium sulphate to add hardness to the water and bicarbonate of soda to add buffer.


New Words

Epsom Salts  The common name for magnesium sulphate (MgSO4 ) which is a very soluble inorganic salt. It is a common agricultural product used as food for crops like potatoes and lemons. It is also commonly used as bath salt. It is a cheap and readily soluble means of adding magnesium to water.

Product Water  The very pure water that has been filtered through a Reverse Osmosis membrane, also known as permeate

Concentrate (Reverse Osmosis)  Concentrate refers to the wastewater which has a mineral ion concentration.

Microporous  A material with an extremely high porosity. Pore sizes are typically less than 2 nanometers.



End 4.07


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