well i modded mine and i get a full cup of black coffee color out of her every week. I changed my air adjuster to a brass one, cut the collection cup 1 1/2 " inches and the inner tube. in a Maxijet 1200 powerhead i did a nano ball mod along with a gutter mesh mod inside the impeller housing . and this thing is bada$$ now .... i haven't seen to many skimmers have the output this does unless they are the badboy skimmers............ OH and i put a buna rubber o-ring in it for a complete seal of the collection cup and silicone it once a week
it deff. competes with some more expensive skimmers