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[Encased in burning magma]

Built a few walls, floored, pumped.
Worked fine.

[slink]

A well did not desalinate saltwater for me in 31.x.

Pumping into a cistern lined with walls and a floor worked.

[Internet Kraken]

A well did not desalinate saltwater for me in 31.x.

Pumping into a cistern lined with walls and a floor worked.

I'm playing 31.12 and it does desalinate water.

[Grimlocke]

Had some weird issues in 40d with water refusing to be desalinated even though it was completely surrounded by construction and not touching any water it wasnt. Never found out why, rebuilding in a different place usualy fixed the problem.

[Quatch]

as I recall, desalinated water falling through a salt aquifer layer (even if not touching anything) would become salty again. That might add to the weirdness.

[JimboOmega]

I almost have to wonder - is the saltiness a function of z-level?  All the solutions - well, pump, etc - seem based around dragging it up to a higher level.  For the ocean one z-level would get it above the salt plain (For lack of a better word), but for aquifers, it'd need to be higher.

Any evidence of that?  I've never embarked on an ocean.

[krenshala]

I almost have to wonder - is the saltiness a function of z-level?  All the solutions - well, pump, etc - seem based around dragging it up to a higher level.  For the ocean one z-level would get it above the salt plain (For lack of a better word), but for aquifers, it'd need to be higher.

Any evidence of that?  I've never embarked on an ocean.

I've never had to deal with salt-water ... yet.

A quick test for those that want to ... dump desalinated water at least 2 Z-levels below the salt-water aquifer, then pump it up one (1) Z-level into a cistern as normal and see if it re-desalinates.  I'd try it, but I know I'd just end up with "extra" fun, and probably fail to get through the aquifer, since I've only just started playing the day before 31.11 was released.

[Jayce]

Can you tell salty water from fresh water by looking?.

[Encased in burning magma]

Can you tell salty water from fresh water by looking?.

Not that I know of.
My method: set it as a water source zone, and set a pond somewhere.
Fresh: they will gather water.
Salt: they will ignore the water source and leave the pond dry.

[Cotes]

Can you tell salty water from fresh water by looking?.

Not that I know of.
My method: set it as a water source zone, and set a pond somewhere.
Fresh: they will gather water.
Salt: they will ignore the water source and leave the pond dry.

It's far simpler than that.  If you designate a zone next to water, it will show "Water Source (X)". If X is zero, then the water is salty, but if it's the number of tiles next to the water, then it's drinkable.

[They Got Leader]

I dug an 8x8x2 square. I then built in a 6x6 cistern. The only connection between the pond and cistern was the pump.

However, my map seems to be flooding with the salt water. The rains cause the water in the ponds to come over the edge and flood the surrounding areas. That may be the cause of the problem.

[Lord Darkstar]

Wells desalinate salt water in 31.x. I've used that technique in several different embarkations. Construct a well over a salt water pond, and you now have a water source that isn't salt water. Useful for bucket brigading farms and giving to hospital patients. I haven't done it in 31.12 itself, but I did in 31.10 and several previous revs of 31.

[Draxxalon]

I'm currently building a fort on a map with a major + minor salt river meeting in a waterfall (major river drops 5 levels).   In that drop span is a salty aquifer.

In 31.08 I built a wooden cistern beside the Major river before it went over the falls, and was able to get clean water, without a well.  (so Z+1 from the "Salt Plane").   Had to abandon that fort, but save-scummed the embark save as I really liked the location.

In 31.12 I tried to build a stone Cistern out of Rock Salt, on top of the Major River, below the falls (the cistern itself ended up more or less in the middle of the aquifer layers, height-wise).   Got Salt water.  Put a well in, still not drinkable.   Figured, well, you know, I did built it out of large pieces of salt... and rebuilt it out of Sylvite Blocks.   Still not drinkable.  I've been planning on rebuilding it out of wood, as that had worked up above, but I've been unable to try yet (my DF time is pretty much limitted to weekends these days).

This could support:
-the "salt plane" affects cisterns/wells built within it.
-certain materials do/don't work at purification (in wells and/or cisterns)

I'm going to experiment with building higher up and with different materials, and see if I get any different results.

[breadbocks]

I almost have to wonder - is the saltiness a function of z-level?  All the solutions - well, pump, etc - seem based around dragging it up to a higher level.  For the ocean one z-level would get it above the salt plain (For lack of a better word), but for aquifers, it'd need to be higher.

Any evidence of that?  I've never embarked on an ocean.

According to the wiki forum, the game saves FPS by not keeping track of whether each tile is salty or not. Just whole layers. IIRC.

[krenshala]

I almost have to wonder - is the saltiness a function of z-level?  All the solutions - well, pump, etc - seem based around dragging it up to a higher level.  For the ocean one z-level would get it above the salt plain (For lack of a better word), but for aquifers, it'd need to be higher.

Any evidence of that?  I've never embarked on an ocean.

According to the wiki forum, the game saves FPS by not keeping track of whether each tile is salty or not. Just whole layers. IIRC.

If thats how it works then the simple test is to build the cistern +/- 1 z-level from the salt-layer, instead of at it, and see if it "suddenly" works.