Phosphorus is a plant nutrient that can encourage eutrophication in surface waters. Many best management practices (BMPs) prevent the movement of phosphorus bound to sediment. Yet, these practices do little to reduce dissolved phosphorus levels in runoff or drainage water. High phosphorus levels in soil will need time for plant removal before they are no longer a source of dissolved phosphorus.
The USGA funded research at Oklahoma State University to design landscape filters. The filters contain material to prevent dissolved phosphorus from entering surface waters. The design of these filters allow for the replacement of the material after it is no longer effective.
Read more here