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Setting a post for a mailbox or other projects in your yard is a quick and easy weekend project you can do with just a few, simple steps.
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Place the form tube into the hole. Set the post into the form and temporarily stand straight.
Pour the dry mix into the tube. Two 50-pound bags of fast-setting concrete will set a 4-inch-by-4-inch (or a 4-inch diameter) post in a 10-inch diameter hole 2 feet deep.
Pour water into the dry mix and allow it to soak in. Use enough water to saturate the dry mix.
Fill the remainder of the hole with soil dug from the hole. It sets in 20 to 40 minutes. Wait four hours before placing heavy objects.