Amazing that they track chlorophyll from space to predict these...

Amazing that they track chlorophyll from space to predict these blooms. Why don’t they just test water bodies for excess nutrients…before it cuts loose?
If I was the Phoslock salesman I’d be testing water, finding high phos then taking the reading to the local water authority and saying “hey pal, when temp warms up you’re a big chance of a bloom that’ll kill your lake and every tourist dollar it brings, wanna buy some Phoslock?”
…”wait til the stakeholders find out you were warned in advance…”