I never worried about it until I started growing veg, and where I am I am not allowed to use any water that isn't drinking quality on fruit or vegetables that are normally eaten raw. So I might give watering lettuce with water that's been standing around a miss. unless you can do it with drip tape or something similar.
I think I will start using tap water instead. It's only for the salad veg, so I'll still be saving water.
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