Using water filtration allows you more control over the big picture. It gives you a clean base to work from and to build up from with your nutrient. Water filtration eliminates chlorine, bacteria, fungi, mold, rust, and many other negative contaminates from your water system. I say get one! Also, if you’re using beneficial microbes or bacteria and you are on city water, it must be filtered; this is because the chlorine and other chemicals will kill off most of what you want to benefit from.