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Cement Products Supply Co., Inc. is Lakeland Florida and Polk County's oldest and largest concrete block manufacturer and brick distributor. They also provide masonry building material including natural stone and cultured stone, glass block, brick pavers and a full line of masonry products and accessories.
The concrete needs to be at least 4 inches thick, and below that you need 3 or so inches of gravel or better yet, paver base which is crushed limestone. Tamp the paver base down to yield a reasonably flat surface and pour 4 inches of concrete over that.
Use a mixing stick to stir the concrete until the mix is homogenous. Push in the tube you made in Step 2, taped end first (the tape keeps concrete from pushing up inside the tube) and let the concrete set for a couple of days. Use a level to make sure the tube is completely straight.