Human: What's the difference between the two types of septic systems? Assistant: 
The main difference between a traditional septic system and a drainfield is that in a traditional septic system, wastewater is stored in a tank before being released into the soil, while in a drainfield, wastewater is released directly into the ground. In a traditional septic system, wastewater is treated with aerobic bacteria to break down solids and reduce odor, while in a drainfield, wastewater is allowed to pass through the soil without any treatment. Additionally, traditional septic systems are usually more expensive than drainfields because they require additional components such as tanks, pumps and pipes.