The present invention relates to post-treatment compositions and methods useful for modifying the distribution of metal biocide in biodegradable substrates such as wood, other cellulosic products, starch-based products, and the like that are vulnerable to decay due to insects, fungi, microbes, and the like. The fluid level sensor probe includes a housing, a first and second electrode, and an electric circuit. Thus, melted portions which are melted by the laser beam can easily be separated, cooled and removed by shifting the laser beam emitting position at high speed. Some embodiments update slack values without propagating arrival and required times, and also without repeatedly evaluating timing arcs to compute gate delays. Each chute rail is provided with a hook mounted on each chute rail proximate the second end of the chute assembly and a bracket assembly mounted on each chute rail proximate the first end of the chute assembly.