You can remove it from a water sample using RO or distillation.
But the lakes will naturally flush themselves of the nutrients much the same way that a human body does.
You just have to get to the point where the natural removal method is greater than the nutrient loading.
Have you ever seen the Scott's commercial ''Feed Your Lawn''. The reason is that without nutrient loading, a lawn will slowly create depleted soil.
It is one of the reasons that we taught to rotate crops and use cover crops.
If they severely restrict nutrients being added to the lake, the lake will heal itself.
But the political will isn't there.
No sense in going after septic systems, if boaters at sand bars are urinating and defecating directly into the water... or going ashore in wooded areas and doing so right next to the lake.
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