Read this if you think decontamination or rubber soles can stop invasives.
Decontamination with some chemicals actually shorten the life of waders and wading boots. Download a State of California DFG study on methods of decontaminating for New Zealand Mud Snails to see the damage done to waders and boots. Waders and boots disintegrated with the use of chemical decontamination.
Plus changing rubber for felt does little good.
"NZMS were observed on the tongue area of wading boots, associated with the laces or the area of the tongue that was tucked beneath the lacing eyelets. Large numbers of small NZMS were present inside of the boots, having worked down between the boot and the neoprene bootie of the wader. If the boots contained padded insole inserts, NZMS were also found underneath the inserts, associated with sand grains."
In the report below, invasives were found under the innersole and other hidden crevices in wading boots. Modern wading boots have drain holes that allow the water to drain from boots once we exit the stream. These drain holes also allow invasives including dydimo to enter, and they are flushed into every crevice of the inner boot as we wade. It is apparent to me that there are plenty of places for invasives to hide besides the boot soles. You could not invent a better method of spreading invasives into the inner boot than drain holes.
To adequately decontaminate a boot you need to remove any inserts and decontaminate each boot part by soaking in a chemical solution.
Click on the link to download a pdf of the official report by the State of California, The Resources Agency, Dept. Of Fish and Game.
In January or 2007, the EPA and The Federation of Fly Fishers published a white paper on Dydymo. The white paper says:
"While decontamination will not destroy all invasive species
, cleaning procedures minimize the possibility of spread. These simple treatments effectively destroy D. geminata algal cells (Kilroy 2005):" The white paper then goes on to recommend a 2% solution of bleach. Clorox is a 6% solution so a 2% solution 2 parts water to 1 part Clorox. Try putting just a drop of that on a pair of blue jeans and see what happens.
So the both the California Dept. of Fish and Game and the EPA recommend what I consider to be harsh chemicals that damage waders and boots. They also admit that there is no single magic treatment for all invasive organisms.