Just a heads up on this product. I purchased one nearly new for 50 bucks. Seller was quite honest stating he could not make the filter stop blowing micro bubbles into tank.\n \nAfter hours trying to find the source of air entering this canister I have given up. There are also numerous complaints about this vary same problem posted on various web sites.\n \nAvoid like the plague. At least I can use the pump on it. Worth the fifty in my case but if I had spent the money on this product new I would be extremely unhappy. I would not even use it on a fresh water tank the micro bubbles are that bad.