Contractor installed a new vinyl liner. He neglected to pump the groundwater down. He said "the groundwater was coming in too fast for my pump". He installed a new liner with groundwater in the pool. My pool water is chocolate brown. My pool is full of mud with silty dirt all over the bottom. The filter system obviously is not going to get the dirt off the bottom. It would take months just to filter the water. What should he be doing to fix this? No, I haven't paid him yet.