When were pressure treated products first used and how long do they last?

Pressure Treated Products were first used in this country in the early 1930's. Several tests have proven the effectiveness of treated lumber to resist failure from decay or insect infestation. One such test was started in Mississippi in 1934 and more than 50 years later, the test posts are still functional. Another example of the longevity of treated wood began in the late 1930's. The Bell System installed more than 250,000 poles by 1947 and not one failure has been found to date. Pressure treating wood does not make it waterproof. It does, however, protect wood by completely penetrating lumber and rendering it useless as a food source for wood destroying insects and organisms. Through a complex chemical reaction the original water soluble solution of CA (Copper Azole) is reduced by wood sugars to form highly insoluble and leach resistant precipitates. The Wolman CA precipitates are fixed in the wood and are non-volatile. They will not vaporize or evaporate. Due to the proven test results treated lumber has shown, Wolman warrants the wooden components of all EZ Do Pools to be free of damage due to decay or insect infestation for the lifetime of the original purchaser.