If they work for a week or so, then its not the pump. Make sure your lines are also not crimped. Do they all do this? they all work good for a week then stop? maybe some one can advise you on some good airstones. You could also run an extension cable and propping the pumps up above the water line cant be that difficult, they can mount to a wall(there should be a hole for a screw or hook in the rubber base.
JackdaWack Reviewed by JackdaWack on . DWC Pump Problems Ok so I have 8 rubbermaids (2 gal or so) with 1 plant in each. I have 4 duel outlet pumps I picked up at walmart however the airline hose to some is fairly long and barely any bubbles come out after a few days of running. They say the output is 2.5 psi. I am aware that shorter hose length is a possible solution but I don't really have the option of haivng the pumps inside the area due to having nowhere to elevate them over the water level and no power source to plug em. So I guess my Rating: 5