Summary:
HOB type of filter. Designed by Aqua Tech for 5-15 gallon fish tanks. Flows about 125
GPH. The filter media allows good bacteria colonies to grow on it promoting biological filtration.
*I am reviewing the legacy model Aqua-Tech 5-15*
Pros: Cheap, Pretty good GPH for 5-10 gallon tanks, Ez-change filter media is easy to find in stores and replace, Fairly sturdy, Quiet.
Cons: After about 3-4 weeks water will start to cloud up (this is no problem if you do weekly or bi-weekly water changes), GPH is probably not adequate for a 15 gallon, Suction tube is short (you will need an extension for a deeper tank), advertised on Wal-Marts 10 gallon starter kit as 175 GPH.
Overall: Decent filter if your on a budget or don't want to spend through the roof for a filter. However if you have the money I would get a better AquaClear filter. Anyway I've had my Aqua-Tech 5-15 on my 10 gallon for 4 years. It does it's job well and I don't plan to replace it unless it breaks on me.
4/5 stars. For bigger tanks these make great secondary filters.