Pentachlorophenol treated wood should not be used in residential, industrial or commercial building interiors, except in laminated beams or building components that contact the ground and are subject to decay or insect infestation. When used for such purposes, pentachlorophenol treated wood must be covered with two coats of an appropriate sealer such as urethane, shellac, latex epoxy enamel or varnish.
EPA has not advised against the interior use of arsenical treated wood because the arsenic air levels measured in homes constructed with this type of treated wood are not significantly different from background arsenic air levels when dust has been vacuumed from the wood surface. Therefore, wood that is pressure-treated with water-borned arsenical preservations may be used inside residences wtihout a sealer, providing that all machined sawdust is vacuumed from the wood surface.
There is a reason you don't/won't see stands manufactured using pressure treated lumber. It needs to stay somewhat moist to prevent warping, checking and twisting. It may or may not happen to you. Personally I would NEVER use it to manufacture a tank stand. 120 gallons is A LOT of water in a room
And why do you know this stuff ?
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