Why don’t we use saltwater in our toilets? Wouldn’t it make sense to use water that we already can’t drink rather than water we potentially could?

  1. Saltwater damages pipes very quickly, and to use salt water that way would require that we make two different sets of pipes for every single building. It would be so complicated, and so expensive that no one would get much benefit from it. And we'd have to replace the pipes every few years.

  2. Okay, so you put in saltwater pumps to supply the toilets. Let's imagine ina seaside hotel. Ona busy day the toilets generate 400 gallons of water. Now, what you have is salty poop water. What do you do with it? You can just dump it in the ocean, it's poop water. You can't bury it, because you'll eventually turn the ground water salty. If you treat it, first you have to de-poop it and then treat it again to desalinate it.

  3. As well as corrosive effects of salt water already mentioned the disposal of saltwater presents its own set of problems - salt water harms vegetation so sewage treatment plants would need to desalinize water on top of what they already do.

  4. You wouldn’t need to desalinate treated water if was dumped back into the ocean (I live on and island and our sewage treatment plant dumps our treated water off shore)

  5. You need to double the infrastructure. Not just two pipes going into a building, but also two pipes going out. Since no treatment plant can handle a mix of fresh and salty water. Then you have the problem of what to do with the salty waste. You can't just pump it in the river, because that would kill the ecosystem.

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