I can tell you from experience that most of the folks at the pool store say what they say because (1) they're trying to sell you something you likely don't need or (2) the're repeating some "advice from a pool expert" AND trying to sell you something you likely don't need. I have one very good friend who manages one of the National Brand pool stores, and her opinion is the only store opinion I trust because she always asks me if I really need a specific chemical when I walk into her store. And I usually just walk out with liquid chlorine and MA.All I have to tell you guys is that if this doesn't work, my husband will never let me live it down...so you better be right. I'm counting on you!
But...I also find it unacceptable that the pool store says replacing the sand last year will basically cause it to be cloudy the entire season?!