Timbersil--Non-toxic pressure treated wood alternative (glass impregnated wood). Anyone used this stuff? It sounds promising but I've been reading up and it seems like Timbersil has some quality issues. If anyone has used it, I'd appreciate a first-hand opinion.

I'm planning on building a wood box/retaining wall for some fruit trees on a steep slope and want to use something non/less toxic. Any recommendations?

ryan