Insufficient water quality due to a nutrient overkill.

Low iron content in the soil compared to the phosphorus content has caused the soil to discharge too much phosphorus into the water column. This leads to eutrophication and algal bloom.

The iron content of the soil is supplemented until the iron-phosphorus balance is restored.

• This method is relatively cheap to minimize soil supplementation
• Iron supplementation will restore the natural iron-phosphorus balance
• This method is safe for humans and nature