Hi! As the title says, I have problems with alot of air in the water after my filter. Just finished hooking up a 8 GPM machine to my tank. Cant run it for long, its just to much air. I use clear hoses to dual feed the pump, so I can see that there is no air in the water before the filter. The filter is 5" with a 1" threaded inlet/outlet. I use the yellow hose to prime the pump and drain the tank. On the end of that yellow hose sits a plastic quick connect that is closed when not connected (gardena). Is the vacuum created by the machine strong enough to pull air in through that connection? Its a belt driven pump.