Sometimes, one soil treatment area just isn’t going to cut it. There are many situations when designers may choose to design multiple zones for an STA or may want to split after flow equalization to pretreatment systems. This can occur with single-family homes and even more commonly in commercial or cluster systems. This is done to build in the ability to periodically rest parts of the system, or it may be required by the system design to minimize pumps or the size of the pumps.Application-dependentGravity - Alternating/Diversion Valves - These valves manually direct flow from one component to another. Diversion valves can
Directing Wastewater in Onsite Treatment Systems
Choosing the right valve when multiple treatment areas are needed
Apr 29, 2026
| by Sara Heger |
















