This UV light box is well made. I am impressed. I have already used it to reduce microbes in a liquid formula that I made. I tested it prior and after I exposed the liquid to 10 minutes of UV treatment and it reduced the colonies substantially. I will increase the treatment time to 20 minutes and test again and I am confident that it will destroy the remaining microbes in the liquid.. I realized this UV box is designed to treat surfaces for bacteria, but I feel that it is a very well made product and I highly recommend it for what it is intended!