Good evening, You have assembled a very nice website. Well organized, easy to maneuver and above all.... Very informative. I'm investigating the purchase of property to build a home. The lot which are considering has a special septic requirement. Per the developer, the lot requires a "Pure Flow" system. Can you elaborate on this "Pure Flow" system, 1.) why the need (?), 2.) the general principle and components involved with the system and 3.) the positives and negatives associated with such system. Thank you for your time, Tracy...