Human: What is the best type of a septic tank? Assistant: 
The best type of septic tank depends on your needs and budget. A gravity-fed septic tank is the most common type, which uses natural settling processes to remove solids from wastewater before it enters the drainfield. Other types of septic tanks include aerobic systems, which use oxygen to break down waste, and hybrid systems that combine both anaerobic and aerobic digestion. Each type has its own pros and cons, so you should consult with a professional for guidance in selecting the right one for your situation.