I bought a villa with a 15x25 ground pool. I'm planning to order lock in the cover to keep the debris out. I am searching for right pool maintenance companies for above the ground pool wall and liner. I'm researching, seeking expert advice and cost estimate from swimming pool installation massachussets. Is it possible to install a waterfall to an existing inground? My friend suggested that it is possible however might be costly. Meanwhile, some say that the waterfalls would cause you to lose more water to evaporation. I intend to drown out the sound from the pool pump and heat pump. I wanna enjoy the sound of water flow rather than noise from the machines. Was wondering if I need a timer for the pump or heater? But may not invest much in a timer at this point. I guess a simple mechanical one would be more economical. Do chime in with your points and suggestions.