Save your money, scrap the Frog. I think everyone here will agree that you should in fact use the "three B's" since most everyone here has had such success with it. Be forewarned, your pool store will kick and scream and give you all kinds of un substantiated reasons why you shouldn't. My advice is not to tell them. As far as upgrading the filter, my personal opinion is to stay with the sand for your size pool.
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