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[Zammer990]

I was purifying some water with screw pumps by getting it into a temporary reservoir, and pumping it into a final one. To my surprise my temporary resevoir (fed by a channel to stagnant surface water) was already purified.
Any idea on what happened? It's still having stagnant water drop in, and convert mid-flight to water

Spoiler (click to show/hide)

[PatrikLundell]

I've seen reports of ocean water getting spontaneously desalinated by being led through a J shaped (when seen from the side) bend up through a grate (and I think the grate wasn't needed). This might be something similar.

[Bouchart]

Screw pumps can desalinate water in some weird way.

[Zammer990]

Screw pumps can desalinate water in some weird way.

I was planning to clean the water with a pump; the issue is, it's not being pumped but still getting clean

[Skorpion]

Because it's not stagnant if it's moving, obviously.

[greycat]

Perhaps you can pause, then check each water tile one by one unti you find the point where it switches from stagnant water to water.

[Iamblichos]

As previously noted, screw pumps purify/desalinate/etc. water to "perfectly drinkable".

[ArmokGoB]

Pumping water through a screw pump desalinates or purifies the water if the cistern never held salty or murky water, or salinates/pollutes water based on what was in the cistern.

[Tiler]

He's not using a screw pump, guys.

And yeah I've had a similar thing happen; I actually got really caught off guard when it didn't happen, once. I figured removing water from a murky pool always purified it; I'm guessing as long as there isn't a "connection" between the murky pool water and the reserve (ie a unbroken stream of water), then it counts as clean, but if there is, then all the water is tainted. I'm not sure how it actually works out.

[Zammer990]

Pumping water through a screw pump desalinates or purifies the water if the cistern never held salty or murky water, or salinates/pollutes water based on what was in the cistern.

I'm curious if there's a flag on each tile marking it as salty or stagnant etc. and whether you can change that flag. But this is just a tube with no pump.

I assume water falling resets itself to whatever its surroundings say it should be, in this case, clean water

[PatrikLundell]

You can clean a contaminated cistern by flooring over the bottom. I suspect removing the floor will still leave it purified, as I've converted drained murky pools to normal soil to see if things would grow on those tiles (which it did, including saplings).
You can probably clean a cistern by paving it as well, although I haven't tried.

So yes, I'd say there probably is a property on the tile to say what kind of contamination is suffers from (including none).

[ArmokGoB]

You can clean a contaminated cistern by flooring over the bottom.

TIL

[Bakaridjan]

Interesting. Zammer990 how far is your drop? I've had a similar set-up before and the water didn't purify but it only dropped 2 or 3 z-levels. I wish I still had the save because maybe I was unnecessarily filtering it a second time with a pump.

[Zammer990]

You can clean a contaminated cistern by flooring over the bottom. I suspect removing the floor will still leave it purified, as I've converted drained murky pools to normal soil to see if things would grow on those tiles (which it did, including saplings).
You can probably clean a cistern by paving it as well, although I haven't tried.

So yes, I'd say there probably is a property on the tile to say what kind of contamination is suffers from (including none).

I tiled over a cistern with raw marble, it remained stagnant (current version)

Interesting. Zammer990 how far is your drop? I've had a similar set-up before and the water didn't purify but it only dropped 2 or 3 z-levels. I wish I still had the save because maybe I was unnecessarily filtering it a second time with a pump.

15 z levels, with a channel and staircase (pictured above)

[PatrikLundell]

And the new water was clean? Decontamination does only remove the current contamination to prevent it from contaminating clean water, but doesn't replace a screw pump (or other method) for cleaning the replacement water.

I haven't done any cleaning since 0.40.X, since I usually use aquifers for water, so the info might be out of date.