I want/need to set up my 15' Intex donut, filter, and solar heater on the lawn this summer. (Actually my wife has made it very clear she does not want it on the nice level concrete patio this year) What kind of preparation of the site is best? It's a moderately level(lumpy,old and thick thatch) site with a bermuda and st. augustine mix. I want to place the pool in the middle of the lawn and intend to take the pool down around mid September. It would include the pump,filter and 2x20 solar heater. This site is always a time and money saver. I am hoping to learn from the experience of others and not reinvent the wheel. Thanks