I think you'll find that the frog will spend a good deal of time in and around the water feature. You'll likely have to clean more regularly, but the filter will help some. I keep my 3.2 group with a really large water container (about 10 gallons at least) and I need to change it every other day. I used to be more lax about it, but I also would see different bacterial infections in my frogs a few times a year. Since I started more frequent changes, much less health issues. I should note that my group is housed outdoors so they are exposed to more potential pathogens.