Rainwater filter

Rainwater filter

Necessity for rainwater filter

Compulsory rainwater reuse by large private facilities
- Since July 2014, rainwater reuse has been made compulsory for large private facilities.
- For the first time, it has been extended to private facilities from public facilities such as public agencies and indoor gyms.

Sizes of large private facilities subject to rainwater recycling facility installation
- Facilities with a roof area of at least 1,000㎡ (for public residence, roof area of at least 4,000㎡)
- Installation compulsory for schools; large commercial shops: at least 2,000㎡, shared residence, etc. with a construction area of at least 10,000㎡

Environmental need for the development of rainwater filtering facilities
- Annual amount of precipitation per person (2,700㎥) is only 1/10 of the global average.
- The UN has categorized South Korea as a water scarce country, with the annual available capacity of 1,550㎥ per person.

Economic need for development of rainwater filtering facility
- Very high dependence on imports. Most rainwater filters available in South Korea are made in Germany or United States.
- Foreign products made of PP materials are replaceable by Korean technologies.

Features of rainwater filter

Highly efficient rainwater filter equipped with multiple filters

· Rainwater filters substituting German and American products have been developed with purely Korean technologies.
· Filtering area radically expanded by improving the internal screen filter structure of imported products.
· Minimal screen clogging through cross rainwater inflow to the top of the screen filter

Product composition

· Trial rainwater filter is made in cylinder with acryl
· Top of the filter mesh is designed to be completely sealed with screen filter
· Rainwater inlet of the rainwater filter is installed at the tangent line to the main body of the filter to facilitate smooth vortex in the filter.
· When rainwater enters the tangent surface of the main body of the filter, vortex is created inside to discharge mesh-filtered rainwater to the filtering outlet, and unfiltered rainwater to the drain.

Strategies to differentiate from existing products


Improvement plan

01 Differentiation through miniaturization

· The rainwater filter to be developed through this research will facilitate more solid detachability of filter elements and convenience of relevant basic structure.
· Most rainwater recycling technologies include enlargement technologies for shared residence, complex buildings, etc. Miniaturization technologies are rare.

02 Structural differentiation of rainwater filters

· The structure of the filter screen equipped at the existing rainwater filter cannot facilitate sufficient filtration, depending on vertical inflow.
· The filter to be developed through this research facilitates full filtration through rainwater inflow and cross flow.

Expected product effects

Classification Content
Technical dimension - Leading Korean market predominated by foreign technologies, including German
- Filter arrangement and form optimization through filter internal inflow analysis that has not been demonstrated in foreign technologies
Economic and industrial dimension - Import substitution through purely Korean technologies in domestic market previously with no alternative to imports from Germany, United States, Japan, etc.
- Opportunity to dominate foreign markets in Mongolia, China, etc. with excellent Korean technologies
Application methods - Active application of this technical development to public sector and private rainwater recycling facilities above certain size, as per the relevant legislative revisions on rainwater recycling in Korea and other countries

Rainwater filter drawing

Detailed filter drawing

Rainwater filter construction procedure

1. Install the water tank.

2. Install the incoming pipes of the water tank.

3. Connect the rainwater filter to the rainwater water tank.

4. Piping (valve)

5. Install the booster bump.

6. Electric instrumentation work

Rainwater filter construction

Construction of highly efficient rainwater filter equipped with multi-layer filter