Natural water bodies are dynamic systems, gifted with the ecosystem components enmeshed in food chains and foodwebs, regulating the individual trophic level in control within a span of time under the normal condition - indirectly called as ecosystem services.  Excessive nutrient control by the 'Constructed Wetland' (or also called as 'Rootzone ecotechnology) : The densely planted  hollow reed grass in the gravel bed up to root-depth with the bottom liner, provides the action of a bioreactor in the rhizospheric biofilm when the nutrient loaded domestic or industrial sewage flows across it. The complete micro-ecosystem generated in the active gravel bed with reed stems and roots pushing air into the root-zone, regulate several nutrient removing microbiological processes, thus significantly removing nutrients from the wastewater, otherwise untreated raw wastewater dosing the receiving water body heavily with nutrients.