Low-fired, porous Terracotta is water permeable when unglazed. Because of this, it has been used since ancient times as a means of slow release irrigation. Known as 'ollas', they are a simple and highly effective technology.
Low-fired, porous Terracotta is water permeable when unglazed. Because of this, it has been used since ancient times as a means of slow release irrigation. Known as 'ollas', they are a simple and highly effective technology.