Copper levels are maintained between 0.2ppm – 0.5ppm.
A copper test kit is provided with every unit and we recommend testing copper levels every 1-2 weeks during summer.
These levels are not harmful and in most cases referred to as beneficial.
You would need to drink about 8 litres of pool water to induce the same amount of copper your body absorbs from healthy food and vegetables on a daily basis.
More information about benefits of copper can be found HERE