I have a terrestrial set up that is a mixture of milled moss and soil over a slab of poly foam with a very large water "dish" for the frog to hang out in. Its easier for me to just remove the dish, sanitize it and replace the water. The poly foam under the soil helps keep the soil from getting too wet my soaking up spillage and excess wetness and thus keeps the substrate from spoiling faster. I prefer this setup due to ease of maintenance.
My Budgetts frog lives in an aquatic setup with a foam insert landing area. I use the Repti Clean 501 canister filter, runs about 75 gallons an hour which is great. I still have to use a turkey baster to remove large turds, which is fine.

Even with a filter you are going to have to do very frequent water changes.