PLEASE HELP!! When I try to vacuum my pool using a vacuum plate/hose in the skimmer, there is little to no suction. I suspect that the lines are clogged (while I was at work, my neighbor "helped" me by coming over and vacuuming without a skimmer basket in place AND vacuumed using the filter (not waste)valve setting. I'm planning on changing the filter sand. Anyone with any ideas on how to unclog an underground 1 1/2in pipe about 50 feet long with at least 2 - 90 degree bends?