They don't grow to 1.8 inches and can't stay in the water for 30 hours. They begin to break down after about 20 hours in water. They reach full balls less than 1 inch in diameter. If you go beyond that they will get a hole which will destabilize them and cause them to disintegrate if left in the water. They are not durable at all, if they have a nick, if a kid picks them up they will break. I would not recommend this product.
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