When gravelless and chamber systems are installed, they are required to be looped or what?

In the context of septic system installations, particularly gravelless and chamber systems, there is a requirement that these systems be looped or capped to ensure proper functionality and to avoid issues related to sewage flow and potential backup. When a system is capped, it means that the ends of the pipes are sealed off, creating a closed system that prevents any potential infiltration of contaminants and ensures that all effluent flows through the designed pathways.

Capping is particularly critical because it helps control the distribution of effluent and maintains the efficiency of the system. If the systems were not properly capped, it could lead to complications such as leakage, ineffective treatment of sewage, or even system overloading.

Other options, such as being individually installed, overflowed, or connected, do not capture the essential requirement for proper sealing and efficiency that capping provides. Thus, the correct answer highlights the importance of maintaining integrity within the system to uphold health and environmental safety standards.