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What substances will NOT be filtered?

A: Any dirty water (even from the ground) can be filtered through the Purifaaya. However, any water that contains substances that are smaller than water molecules will be able to pass through to the bottom. This includes salt water, which will remain salt water at the bottom of the filter. The Purifaaya also won’t filter chemicals that may be smaller than water molecules (which is also true of boiling water).