I can not believe the amount of junk i am pulling out of this pool! I have a pile of leaves large enough for a small child to play in, and i have to back wash the filter about every hour or 2. The pressure hits about 20 PSI and time to dump all the black stuff out. The wash out comes out looking like coffee! Oh, and it turns out that the pool hasn't been opened for 5 years. Thankfully the liner isn't stained where the water level has been sitting for that long.