My pool is three years old. Every year when we open it the water is beyond disgusting. Mold and slime is so thick. This spring I had to drain it just to get rid of a relentless CC that would not break after almost three weeks of slam. The pool is fiberglass in ground. It has a roof made from Polycarbonate. I had no issue draining the pool June 6th, during an unusually wet spring. The other issue is the antifreeze. The amount used is the same for my 2300 gallon pool as it is for an 18000 gallon pool. I pump to waste as much of it as I can, but what's in the return lines just goes into the pool. It's not diluted as much as a larger pool. If it only takes 3 hours to fill it, why am I trying so hard to keep the water?
I included some pictures to illustrate how the pool is constructed. The soil is very sandy. It is built on a small section of flat at the edge of a long sloping hillside that droops 80 feet. I can stand at a level even with the bottom of the pool just 15 feet down from the pools edge. The concrete patio above the pool is properly drained. Very little water can make it into the pool room, and has to go through the screens. Water does run away from the pool on all sides. My point is it's pretty impossible for the water table to exist in this location.
Can I just drain it completely for the winter?
Will it harm the pool cover to have it not supported by water?
Can I be sure all water can be drained from the lines?
Alternately should I drain it as shown, about 1/4 of the water remains, and just drain it the rest of the way in the spring?
Are there any other issues I should be concerned with?
Here are the pictures. Thanks in advance for any guidance!
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