Water with a pH below 7 is acidic and corrosive. Raising the pH will neutralise the water, removing the metallic taste and pipe corrosion, and can also reduce any iron or manganese contamination.
The backwashing head has the advantage of remixing the media and removing any debris or iron/manganese. Backwashing the units stops the media compressing and stops it going hard which can happen with in/out systems.

This pH neutralisation unit is supplied partailly assembled for shipping. Some assembly will be required. All components and instructions will be supplied.