I can help you design this if you like. Im currently in Alaska, over 50% of my projects are direct draw off natural water. I also have previously worked in Colorado (90 percent of the work was direct draw, dirty water, with invasion issues) and Idaho where all my customers lived on the same lake (big Lake) and drew water directly from it (including the golf course). I dont require any money... but this IS my thing. I deal directly with HD FOWLER down there in washington. Who do you use for a supplier? I also have connections in Colorado for custom pup skids and controllers if necessary (the Smart box X2 comes to mind as something that might be needed) What brand of controller do you commonly use. I would stay away from valve in head design if it's not something you normally do. selling the customer something you are ill suited and poorly trained to service is a really bad idea, there are plenty of good heads out there these days to deal with the dirty water, depending on how slimy the water really is, I can help you spec a filter for the pump system and as a last resort, there is always maxi paws (if you are honestly just pumping straight silt-filth) Send me a PM if you want some live consultation design help on this. I can also put you in contact with my washington and colorado people, or just run the leg work and go between for you.