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How long does 0.9% Sodium Chloride (saline) soultion really last for once opened?

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Well the bottle says dispose after 24hrs the pharamsists all say no more than 28 days my mate who uses the same this says until it starts to smell ify.

I ask cuz i use it for my eyes when i feel tired, itchy or dry, i use it to flush wounds and even use it to clean my pets eyes when they have discarge or infections on the and i use it for my pets stiches.