Why is water so clear in caves?



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    Water found in caves tends to have hundreds or even thousands of feet of filtering as it makes its way through soils and substrate before ending up in cave pools. Despite this fact, swimming in and drinking cave water is generally not recommended. Concentrated salts, bacteria such as giardia and cryptosporidium, pesticides, and fertilizers can end up in cave water. Also, water found in caves near residential communities can contain pesticides, fertilizers, cleaning solvents, and pharmaceuticals. Nitrogen levels can be high if the cave is located near farms or a waste water treatment facility.

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