> For the complete documentation index, see [llms.txt](https://swatplus.gitbook.io/io-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swatplus.gitbook.io/io-docs/introduction-1/structural-practices/septic.str/typ.md).

# typ

The septic system type is a foreign key referencing [name](/io-docs/introduction-1/databases/septic.sep/name_sepdb.md) in [**septic.sep**](/io-docs/introduction-1/databases/septic.sep.md).

| Name | Description                                                               |
| ---- | ------------------------------------------------------------------------- |
| GCON | Generic type conventional system                                          |
| GADV | Generic type advanced system                                              |
| COND | Septic tank with conventional drainfield                                  |
| SAS1 | Septic tank with sand absorption system 1                                 |
| SAS2 | Septic tank with sand absorption system 2                                 |
| SAS3 | Septic tank with in-tank N removal and sand absorption system             |
| SAS4 | Septic tank with effluent N removal recycle                               |
| SAS5 | Septic tank with corrugated plastic trickling filter                      |
| SAS6 | Septic tank with open-cell form trickling filter                          |
| SPF1 | Single pass sand filter 1                                                 |
| SPF2 | Single pass sand filter 2                                                 |
| SPF3 | Single pass sand filter 3                                                 |
| SPF4 | Single pass sand filter 4                                                 |
| RCF1 | At grade recirculating sand filter                                        |
| RCF2 | Maryland style recirculating sand filter                                  |
| RCF3 | Recirculating sand filter                                                 |
| CWT1 | Septic tank w/ constructed wetland and surface water discharge            |
| CWT2 | Municipal wastewater w/ constructed wetland and surface water discharge 1 |
| CWT3 | Municipal wastewater w/ constructed wetland and surface water discharge 2 |
| CWT4 | Municipal wastewater w/ constructed wetland                               |
| CWT5 | Municipal wastewater w/ lagoon and constructed wetland                    |
| BFL1 | Waterloo biofilter (plastic media) 1                                      |
| BFL2 | Waterloo biofilter (plastic media) 2                                      |
| BFL3 | Peat biofilter                                                            |
| TXF1 | Recirculating textile filter                                              |
| TXF2 | Foam or textile filter effluent                                           |
| GFL1 | Septic, recirculating gravel filter, UV disinfection                      |
| USPT | Untreated Effluent - Texas A\&M reference                                 |


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