I am planning on buying a plastic swimming pool from Walmart for our geese but I am debating on the size. I really think they need the largest one BUT I know from experience it is a pain in the behind to empty, VERY heavy! Does anyone use a pump or siphon or something to drain it? I know it will have to be cleaned at least once a week and want to resort to a smaller pool just beacause I physically can't lift a huge pool of water---- there has got to be an easier way!