We just went through the conversion a few weeks ago. Our pool store and everyone on this forum said to change our sand (my husband wasn't very happy, we had just put new sand in our filter.) When we changed it a bunch of baqua junk was in the sand. We were very happy we changed it (even my husband) we dont know if all of that junk would have caused problems or not but it wasn't worth the risk. Our pool has never been better.
Good Luck!
Leslie
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