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We just drained our 33,000 G. inground gunite pool for the second time. We used our commercial pump to remove the water. As you get to the bottom of the pool there is a cap next to the drain in the bottom of the pool that should pop out because of the ground water pressure. We then place the pump hose over that hole to control the groundwater coming up through the hole. Note that before we get to that point, we've already taken bleach (weed spray cannister) and sprayed the walls with the bleach and washed with water. The pool is sparkling clean. Better than an acid wash. Once completely cleaned we place the cap back on and place two garden hoses in the pool and start refilling. It takes two days to refill. Good luck!

Ans: The drain grate at the bottom of the pool is not actually a drain as in bathtub drain. It's purpose is not a drain but is there only to circulate the lower portion of the pool water. That grate's Plumbing is connected to the skimmer which is then connected to the pump. It is like a closed circuit plumbing installation. To drain water off you need an an external sump pump that you drop into the pool - usually with a garden hose and an electrical cord attached. Some sump pumps can use hoses up to 2" in diameter.

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