To my knowledge, we have not come up with a good way distributing nutrients back to the ocean without causing massive, deadly algae blooms.
Have you read and attempted to understand the effect and purpose of my patent?
Once you can follow what the technology does, getting phosphate into or out of a water column is a no brainer.
You isolate the algae prior to adding the phosphate. Never add phosphate directly to the body of water.
A lot like skywriting, I envision the opportunity to paint clear patches of ocean with minor color variations. Even dramatic contrasts of reds, greens, golds, and blues.