Absolutely do not drain the water until you have a set of drop-based test results for somebody to look at. Is this a chlorine or Bacquacil pool? If a chlorine pool, then please get a good test kit (we recommend the K-2006 kit linked in my sig) and run a set of tests on your water. Post them here and we can probably get you going without draining the water. Also take a few seconds and fill out this chart about your pool info so we don't waste a lot of time going back and forth asking basic equipment questions.
Pool Chart Entry Form
Pool Chart Results
Draining is a pretty drasic measure, and there's no reason for you to do so if you don't have to. I don't know your pool store guys, but I already distrust everything they've told you based on the statement that there are "to many chemicals in it already". Sounds like they want to sell you some more. Don't buy into it. Let us look at some solid numbers and we'll be happy to help you go from there.
Welcome to the forum!!
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