Also, if you want some overkill in figuring out the dilution of your pool, you can grab my calc in my sig. There's a dilution section in there that you can put in the size of your pool and it will tell you a percentage drain to get to a number that you want. Either that or you can fiddle with the numbers to see where you would end up from a partial drain. Either way, it's something to play with.
Oh and there's another nifty way to do a water change without floating your pool. What you need is to source a HUGE sheet of plastic. Throw it over your pool. pump water out from under it with the pool pump, and refill on top of the plastic. As you pump out from under and refill from the top, the plastic will sink down into the pool. The plastic will keep the water separate, and you can actually change 100% of the water in one shot this way, if you can find a sheet of plastic big enough. This is a trick that vinyl pool owners use to change water without ruining the water.
Michael
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