We developed a leak in our pool in our underground drain. We were losing water and didn't know why till Arrow Pool company came and sent a "diver" down to shoot dye into the bottom drain. After finding out what the problem was and how much it would cost to fix it, Arrow was real good to suggest we simply close off the bottom drain ourselves. I found that this was great of the company to actually suggest a solution without trying to get money out of us to fix the problem. We did close the drain and, knock on wood, two summers later the pool is working fine.
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