I've had 2 aquaclear 500's in use for the last 7 years straight. They have about 12 years total of run time on them. I had a two year downtime with tanks, cleaned these up, and they statred working instantly. Easy to use and relatively cheap.zekni;305629; said:My favorite longest lasting filters are aquaclear 500s. For the $$, they turn a LOT of water, and last forever. Never had a cannister last that long without something breaking.