Plants are the best filters around and don't cost a dime to run. Just add a Coralife circulator for some water movement and do a 25%-40% water change weekly. I have 4 tanks. Three with filters and one planted as above. The planted tank is clearer, healthier, looks better and requires less maintenance than the others. Don't believe all the hype about watts/gallon for plants either. There are a ton of plants that do very well in low light tanks. 1 watt/gallon will grow just about anything that's not a low growing ground cover type of plant like 'baby tears'. But it's still enough to grow some low growing Crypts very well.
If you really want to go with a filter I've had good luck with:
Marineland canister filters; they're a little bit of a pain to clean, but I've never had one fail.
Marineland HOB (hang-on-back) filters; good filter for the money, but only seem to last a couple of years.
Eheim Eco Canister filters; I use one of these on my Goldfish tank -read tons of debris to filter- and it works like a champ. The design is almost identical to the Marineland canister.
Ehiem Pro Canister; this is by far the easiest to clean and reinstall. Has a huge volume so cleaning is a semi-annual event instead of monthly and it runs silently. This is, however, the only filter I've ever had any real problems with. Nothing mechanical, just a seal that likes to leak. I may have just gotten a bad seal in mine. Everyone else raves about these filters, for both their effectiveness and ease of use.
Knowing a little more about your set-up would be helpful. What kind of fish, how many, type of lighting.............
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