Is it okay to circulate the antifreeze through the pump and filter and back into the pool? Last fall I blew out the lines and I think I put in roughly 8 gallons (2 gallons in each line). If it is advisable to get as much antifreeze out as possible, how would one go about accomplishing that? I'm thinking to create a bit more suction...close down the line valve at the pump and use the shop-vac pool side...might get a little, anyway.