No, copper is an essential element, necessary in various proteins and enzymes. Balance studies on adults suggest an essential daily intake of 1-5 mg. The copper level at which the Enviroswim system operates is only 30% of the maximum recommended Queensland drinking water concentration. You would need to ingest between 3 – 15 litres of pool water to get the recommended daily intake of copper. The copper concentration in the Enviroswim backwash water contains less copper than the waste water from some household municipal water suppliers. The silver content is also well below drinking water guidelines.