I need to do a partial drain of my in-ground pool. I am not able to use my main drain for this purpose (main drain is not functioning), utilizing the waste valve setting on my filter. I can set my valve to either close the skimmer or close the suction side port that I attach my Hayward cleaner to. Would it be safe to remove about 35% of my water by keeping the Hayward cleaner attached to the suction and close off the skimmer? It seems like this should work since the cleaner will always be at the bottom of the pool. I know it will move from deep end to shallow end. But if I watch it, it seems like this could work. Is there anything I'm not seeing that could be a problem? Thanks