<human>: Can you condense the text into three sentences or less?

My husband and I currently rent our house which happens to have a pool. Our contract states that we are responsible for maintenance and cleaning of said pool, which to make sure everything is done correctly we pay the pool service that the landlord prefers to take care of it. 
     When we went to start thinking about opening the pool for the summer we noticed that the pool had drained. It turns out that there is a hole in the liner somewhere presumably toward the bottom. 
     Our landlady has been awful to work with  since the beginning. We pay our rent on time every month, and we have done repairs out of pocket that leave the home in better condition than when we moved in. We have only asked her to fix one issue during the almost three years we have lived here.
     We had a plumbing issue in which water was backing up into the house. We have no children, but she kept insisting that a child must have flushed something down the toilet, and that we would be responsible for the repairs.  When she was finally faced with the reality that nothing had been flushed she asked to see the contract because she was sure that all repairs were our reponsibility. They were not, and the pipes were fixed. I could tell you a couple  hours more  worth of stories about her that would blow your mind but I will stick to the current issue from now on.
      I beleive the pool liner has a hole in it from normal wear and tear which means she should pay for it, but she is refusing. She again is claiming that a child must have ripped the liner. I am so frustrated with her, but I don't know if I have any recourse. I realize that a pool is not a necessity, but I do not want to pay costly pool repairs for a pool that is not mine. Also, she has threatened to take our security deposit if we do not fix it. It's starting to feel like I am renting a money pit.  Any advice would be greatly appreciated.
<bot>: our landlord is seemingly of unsound mind, and is trying to make us pay for expensive repairs that are normal wear and tear.