This product is made from calcium carbonate, which reacts with acids and water, so if it rains they will fall apart and disintegrate. However don't leave the container outside, or leave the top off, because any water in the container will waste 8 bucks (plus shipping)
In the end, a very good product. In dry places where it doesn't rain a lot, sprinklers will take care of it. Also, if it falls in the pool, it will be the last you see it.
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