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No matter the method by which it is applied, concrete is a fascinating material. The history books tell us that it's been in use for thousands of years - as far back as 6500 BC, when it was used by Bedouins to make cisterns in which they collected and kept water underground in desert climates. The ancient Greeks used concrete, too, as did the Assyrians and especially
In recent years, it's been difficult to avoid two large and related discussions about water treatment as it relates to swimming pools and spas. One the one hand are discussions of the evils of chlorine, which, after more than a century of common and beneficial use, is still widely misunderstood by homeowners and many professionals in the watershaping trades. On the other are conversations about chlorine-free pools and spas - another set of exchanges where there's proving to be
