The "tornado" thing you are talking about is normal. Are you filling the vac hose with water to purge the air before you vacuum? I hook the hose to the vac head and submerge it. Then, I take the other end of the hose and hold it in front of the return jet for a couple of minutes until I quit seeing big air bubbles coming out of the vac head. Then, I put it into the skimmer. If you are not doing this, try it and see if it solves the problem. By the way, you do NOT need to change your sand. I'm on my 11th year with the same sand and there are others with sand they've had for even longer than that.
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