I have been using an APO for 20 years on both of our truckmounts and it is awesome. You don't have to worry about high temp heated water by the time it is pumped out as it is only cool water by the time it is pumped out. The garden hose is barely noticeable (it's a black rubber 3/4" ID hose). No debris is pumped out because the wastewater passes through 2 fine filters so there is no debris coming out, only water.
The majority of waste water from TM or Porty usually is Grey water however it still should never be allowed to run into the street, especially if it connected to bay, or a creek. The safest way is to drain into sewer lateral. if not then on ground/dirt grass where non consumption plants/herbs are at or near marine/aqua habitants. if there are Solvent spotters used or reducers used then drain into sewer lateral