# How a Septic Tank Filter Cleans Wastewater and Removes Solids

> This patent describes a filter system for septic tanks, featuring a submersible housing with filter elements designed to catch solids from wastewater and then allow those collected solids to be removed.

- **Patent:** US 12734467
- **Original title:** Septic tank effluent filters
- **Granted:** 2026
- **Status:** Active
- **Times cited:** 0
- **Field:** wastewater_treatment, environmental, mechanical, construction

## What it does

The patent describes a filter vault for septic tank effluent. This vault includes a filter housing that is at least partially waterproof and can be submerged. The housing has an inlet opening that lets dirty wastewater, containing suspended solids, flow in. Inside the housing is a filter assembly with one or more filter elements. Each filter element has an upper and lower end and a filtering surface that touches the wastewater. A key feature is that the inlet opening also allows accumulated solids from the filtering surface to exit the housing, which helps with cleaning and maintenance.

## What it does NOT cover

- Does not cover filtration systems that are not at least partially submersible.
- Does not cover filter housings made entirely of permeable materials.
- Does not cover filtration methods that do not use distinct filter elements with exposed filtering surfaces.
- Does not cover systems where accumulated solids cannot exit the housing via the inlet opening.
- Does not cover filtering wastewater from sources other than septic tanks.
- Does not cover filters that do not allow solids to exit through the *same* inlet opening used for wastewater entry.

## The clever bit

The clever part is how the inlet opening serves two purposes: letting unfiltered wastewater in and also allowing accumulated solids from the filter surface to exit the housing, simplifying maintenance and potentially improving filter longevity.

## Real-world examples

1. Residential septic systems
2. Commercial wastewater treatment units
3. Onsite wastewater disposal systems
4. Effluent filter cartridges

## Why it matters

Septic tank filters are crucial for protecting the environment by preventing harmful solids and pollutants from entering groundwater. Innovations in this area aim to make these systems more efficient and easier to maintain. This patent contributes to that goal by proposing a design that simplifies the removal of trapped solids, potentially leading to longer-lasting and more effective septic systems.

## Frequently asked questions

### What does How a Septic Tank Filter Cleans Wastewater and Removes Solids cover?

This patent describes a filter system for septic tanks, featuring a submersible housing with filter elements designed to catch solids from wastewater and then allow those collected solids to be removed.

### When does this patent expire?

This patent is expected to expire on September 15, 2046, when the invention enters the public domain.

### What problem does this patent solve?

Septic tank filters are crucial for protecting the environment by preventing harmful solids and pollutants from entering groundwater. Innovations in this area aim to make these systems more efficient and easier to maintain. This patent contributes to that goal by proposing a design that simplifies the removal of trapped solids, potentially leading to longer-lasting and more effective septic systems.

### What does this patent NOT cover?

Does not cover filtration systems that are not at least partially submersible.

**Full plain-English explainer:** https://patentbrief.org/patent/us/12734467/septic-tank-effluent-filters

**Original patent:** https://patents.google.com/patent/US12734467

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_Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._