What magnification? You can easily see Uronema at 40x. But in order to actually see bacteria swimming, you'll need a lens with at least a 400x magnification. A 1000x magnification can show bacteria in stunning detail.
I looked at 40x and 100x. My microscope goes up to 1000x but I didn't go that high - I was mostly looking for uronema. I'm really still learning with it. If the last doesn't make it - although she looks pretty good right now - I'll look under the higher magnification also.