The filter could make the fabrication of a shield easier. The link posted and there search did not let me get a look at the Berg filter. I have used the K&N type filters on other machines with good success, but I do notice that fine particles still get through, and there more susceptible to water getting through them. When I was into quads/sand riding we used a product called "outerwears" over our filters, it is a fine nylon type cover that breaths well and helps shed the water away from the filter. This could also go over a foam filter and provide the same protection, I'll look into what materials are needed, it could be a very simple answer to the water issue.