I have owned this pool for 28 years and never had this happen. Hooked it over the weekend, and when I run the pump/filter with the "eyeball" on the return, the pump looses some of the suction, and the water in the skimmer swirls and has a vortex. If I remove the "eyeball", everything runs great. Checked hoses, O-rings, etc. Everything ok. If I run the pump with the filter turned to waste, it runs great, but back to circulate with the "eyeball", problems.