Re: Pressurized timbers

**"* A* <j*@aquapic.com>**

On pressure treated timber, there are a number of reasons that CCA 
(Copper/Chromium/Arsenic) treatments are being phased out, or their 
use reassessed, in many countries worldwide.

One is the possibility of small amounts of Arsenic leaching from the 
wood surfaces. Arsenic is toxic and possibly carcinogenic.

The other problem is what happens when the wood structure is finally 
disposed of. If it is burnt, the small ash particles will contain the 
remains of the toxic preservatives and might be inhaled.

I looked into CCA with regard to the use of treated timber by or in 
fishponds. Pressure treated timber is still considered more effective 
and safer than many of the solvent based, painted-on preservers. 
However, pressure treated timber can cause problems to fish, 
especially in small enclosed ponds. This is especially the case when 
freshly cut, unweathered timber, is placed directly in the water.

James Allison

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