• YerbaYerba@lemmy.zip
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      2 days ago

      It prevents calcium carbonate buildup on the RO membrane. The acid is added to the incoming sea water to keep it slightly acidic.

    • orclev@lemmy.world
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      2 days ago

      Might depend on the source water. The article mentions it’s used for water softening so if you’re starting with water that has low mineral content maybe it’s an unnecessary step.