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[chickenbaconranch]

Hi guys, I've been having trouble with getting clean water for my hospital. I was under the impression that screw pumps filtered the water from whatever contaminants it had. Am I wrong about this? I've tried a few different things, like making the floor and walls out of rock, pumping the water onto the same level as the pump and 1 level beneath it, making the ceiling out of rock along with the walls and floor. No matter what i do i end up getting muddy water, and my hospital starts looking ridiculous with 3 or 4 screw pumps in it trying to get clean water. I dont have the most current version of DF, my version is v0.34.07. I'm using rock salt and wooden screw pump, and im getting the water from a river which flows into a canal i dug to reach my fortress

[NecroRebel]

Mud isn't actually a contaminant that is in the water like salt or stagnation is. It's just that any floor, ramp, or staircase that gets water on it becomes muddy. As such, there's no way to stop a 1-level cistern from having a muddy bottom, and any water brought out from a square with a muddy bottom will be considered dirty. On the other hand, a 2-level cistern's top level has no such problem if the top level of it has no floor, ramp, or staircase tiles in it, so drain your cistern, channel out the bottom, and refill it to solve the issue.

Also, what your screw pump is built out of and where you get the water that you're pumping doesn't matter for the water's cleanliness.

[slink]

The stagnant water contagion bug was fixed in 34.09.  You might want to upgrade.

[chickenbaconranch]

awesome ill try that out, thanks necro

[Khym Chanur]

If the floor tile is covered with "a pile of mud", like the bottom of cavern lakes/pools, then water taken from it with buckets will be "laced with mud".  You can get rid of this simply by draining/pumping the cavern water into a cistern, since the "dusting of mud" in the cistern won't cause any problems for water drawn out of it.

[krenshala]

The stagnant water contagion bug was fixed in 34.09.  You might want to upgrade.

I just confirmed this in 34.09.  New embark and there were some tiles in the river marked as stagnant, but by the end of the week (when I remembered to check again) they were all gone in the river, but still present in the murky pools as they should be.

The fun part comes in discovering just what criteria are needed for fresh water to become stagnant (other than contact with stagnant water).

More on-topic: I second the suggestion to have your water source an additional layer deep.  I personally use three z-level deep cisterns so I can run it down more before refilling, but two z-levels is sufficient.