I am purchasing a pool next week and I am debating the intex 42" high rectangular pool vs. the intex 52" rectangular pool. I would really like the 52" pool but my son can only stand with his neck above water with a water level of 42" right now. I wanted to buy this pool so he can have room to grow, and we can fill it higher next year when he is taller. The only issue I see is that the horizontal sides will bow if they are not at the proper height. Does anyone have an intex rectangular pool that is filled below the recommended water line? if so, can you let me know how it is working?