Question, a friend helped me close our inground pool this year. We filled all lines with Pool Antifreeze. Once it is time to open, I know I can start the pump and filter to waste to remove the antifreeze from the suction line. How do I remove the antifreeze from my return lines? Our pool has a safety cover, but fills up with rain water over the winter. Confusing to me, I do not want the antifreeze to go back to my pool water. Thank you!