Home Retrofit: Greywater Planters, Blackwater Planters, Catchwater System

  • Dig planters into the ground and line with plastic.
  • Plumbing lines to and from the buildings.
  • Solar powered recirculation.
  • Cisterns to catch water with WOM (Water Organizing Modules).
  • Supply fresh water, year round.

Greywater Planter

  • size: 150 sf. / 7’ x 21’ rectangle. depth: 3’ - 5’ slope.
  • gWOM for greywater irrigation.

Blackwater Planter

  • planter size: 77sf. / 7’ x 11’ rectangle. depth: 3’ - 5’ slope.
  • bWOM for toilets supply.


  • Gutters to downspouts to silt catches to cisterns to filters.
  • WOM pumps and filters water to house and to a fruit-tree grove down-slope.
  • Cisterns
  • Accommodations: A student house next to the job site.
  • Food: Local markets and cafes.
  • Travel: Fly in to Liberia, Costa Rica. Shuttles are available.
  • Participate as much or as little as you like. Attend one day or all days.
  • 10am - 4pm each day. Weekends are off.
  • Textbooks available for purchase.
  • all sales are final. there can be no refunds… credit can be used for future workshops.
tao design build
in partnership with Tao Design Build

April 23 - May 10


Liquid Waste Water Treatment

The liquid waste water treatment system is a containment, treatment and distribution system for liquid waste water. This system is similar to the wetlands concept which has long been used in exterior applications for thousands of years by humans and nature. This system differs from the wetlands approach in that it treats and processes the ‘untreated greywater’ inside the building.

> more details: PangeaBuilders.com/Systems/liquid-waste-water-treatment

greywater planter costa rica


Catching Water from the Sky

Water is caught from a roof with a potable surface. From the roof, the water is channeled through silt catches into cisterns. Cisterns are sized to the local climate and are best buried and completely protected from the sun. The water from the cistern is gravity-fed into a Water Organizing Module with a pump and filter. The pump pushes the water into a pressure tank to supply code required water pressure. The filters clean the water for consumption and cleaning.

> more details: PangeaBuilders.com/Systems/water

catch water organizing module

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