Both RO and UV purifiers perform the same function of killing bacteria. However, there are several other pointers to consider as well when it comes down to these two. While the UV filter kills pathogens, these dead bacteria remain in the water you drink. RO, on the other hand, removes these floating dead bodies alongside killing them. UV filters do not perform the function of removing dissolved solids and salts, while RO does. If your primary concern is muddy water, you must opt for RO as its pre-filtration system separates the mud from water. Whereas UV filters cannot separate mud sediments. Remember, RO purifiers only work with high water pressure and need electricity to boost pressure. Ultraviolet filters can work with all kinds of water pressure.