I used Poolmaster to open, close and maintain my pool. When it came to closing the pool, I had to call several times because the cover kept slipping into the pool as they had not ensured that all the water bags had been filled and placed correctly. While they did come back once to attempt to fix the problem, it was not resolved. My second, third and fourth calls were ignored leaving me with a pool cover that was not functional. Poolmaster understands that businesses need to be paid, but I found the reciprocal relationship between customer and business on their terms. I have been most disappointed by their customer service and will not use them again.