# Trickling filter

> type of wastewater treatment system with a fixed bed of rocks or similar

**Wikidata**: [Q1751102](https://www.wikidata.org/wiki/Q1751102)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Trickling_filter)  
**Source**: https://4ort.xyz/entity/trickling-filter


## References

1. Freebase Data Dumps. 2013
2. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)