We are new to the whole inground pool and have an 18x36 pool that holds roughly 25,000 gallons. this past winter we did not have a cover for the pool and in combination of our dog and my wife there is at least an inch of dirt in the bottom of the pool. The vacuum is not working to get the dirt out. It is a soft liner so we can't empty the pool. Please help. We need to get the dirt out but not sure how to do it. any suggetions would help greatly appriceated!!!!