Is it possible to use floating farms to filter polluted rivers?

I live in Ohio and recently I’ve noticed toxic algal blooms have become a huge issue and we’re in the news. I’m not sure where I read it, but I’m under the impression that the algal blooms are growing due to a lack of legislation limiting the fertilizers that farmers can use and/or controlling their runoff. The general consensus is that because our legislators are in the pockets of the local agriculture industry, this is likely to occur again.

The massive algal bloom is occurring because their is a high level of nutrients (toxins?) in the water systems, so why not capitalize off of it since our legislators are unlikely to make the positive change necessary? Recently there has been research into floating greenhouses and their potential to clean the river by pulling nutrients from the pollution.

So what’s stopping this from being widely adopted? I’m not an environmental engineer or a biologist so my knowledge on the issue is limited, but I currently don’t see any reason why this isn’t being widely adopted to make the best of a bad situation.