Biocide Systems appears to be a legitimate company based on customer reviews. The company has an average rating of 3.5 to 3.7 stars on Trustpilot, with a mix of positive and negative feedback. Many customers have reported that the products are effective in eliminating odors, such as mothball, mildew, and perfume smells. However, some customers have experienced issues with product effectiveness and customer service. The company is verified on Trustpilot, which adds to its credibility.