Let multiple Water Treatment Facilities treat one body of water!

I had a great idea for a park (image attached), to have a large river with boats riding through, and many habitats with semiaquatic animals alongside it.

Dealing with the large water volume can be a pain but it was worth the result, however after only 2 habitats I noticed occasional popups of cleanliness issues within the habitats.
I tried adding additional water treatment facilities but they would not treat any bodies of water because the main body is already being treated.
Seeing as how it was not possible, I just moved on and added more habitats. Now at 4 habitats, the water is constantly dirty and murky and the habitats unclean.
Would it be hard to prevent this by making multiple treatment facilities clean 1 body of water?
 
Yes for this! one water treatment thing can hardly manage a big body of water that is used by multiple animals.
 
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