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Can anyone find any reason to actually use it?
I ran the numbers against a Mk 3 electrolyser and came up with 10 salination plants per electrolyser to keep it fed.
The only time it would make sense with that kind of ratio to use it for me would be when space for piping the electrolyser is an issue, but with 10 salination plants, there is a massive amount of space going to waste that could be better used to put together a more efficient factory block.
The inefficiency and waste is unreal. For my chlorine production it would take more than three times as many salination plants to use molten salt. Granted, molten salt means less piping fluids which is never a bad thing.
-the math
40 chlorine per second goal

5 per second with molten salt, 4 per second with saline
need 8 for molten salt, 10 for saline

To feed, 8 mk 3 electrolyser with salt({10 salt per [2 sec/2]*8= 80 salt per sec) requires 80 salination plants(10 salt per [10 sec/1]/10=1 salt per 1 second) 80/1=80
to feed 10 mk 3 electrolyser with saline({10 saline per [2 sec/2]*10= 100 saline per sec) requires 25 salination plants(40 saline per [10 sec/1]/10=4 saline per 1 second) 100/4=25

It is usefull if you need sodium hydroxide. 5 clorine and 5 sodium hydroxide per cycle

I did play around with it on the KoS community map and I will probably buff both processes (salt and molten salt), they are too slow and dont yield enough stuff.