How to keep the water dirty?

For some of my enclosures like the crocodiles enclosure I do not want 100% crystal clear water as I would like to build a swamp looking enclosure. But although I have set the cleanness to like 40% as I fill in the water, the water pumps will clean the whole water to 100% after a while.
How can you keep "dirty" water with lower cleanness? I mean I just could not use water pumps, but this would then increase the disease rate of the animals.
 
it may be a workaround but you can try to let it look dirtier with the special effects from construction menu. there are some dirt effects in there iirc
 
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