Water is fundamental to human life and providing clean water that is free of microbial
contaminants and heavy ions is very necessary. Increase in the human population in the
developing countries in the Western Sahara including Nigeria coupled with the lack
social amenities like electricity which could be used for pipe borne water production
makes it very difficult for the local communities to access clean water. Among the
distillation processes, solar distillation is highly recommended for the fact that it
requires only solar radiation which is readily available in these countries most
especially the Northern Nigeria. In this paper, a basin types double slop passive solar
still with multi outlet was designed and fabricated using the available local materials in
Yola (9.23oN, 13oE) North-Eastern Nigeria. Its performance was evaluated at different
initial water depths thus: 1.0 cm, 1.5 cm, 2.0 cm and 2.5 cm. The daily cumulative yield
was maximum, 3306 ml (≈ 3.31 L) at 1.0 cm initial depth and minimum, 1998 ml (≈
2.0 L) at 2.5 cm initial water depth. The maximum computed instantaneous thermal
efficiency (ηth) is 68.90 % at 1.0 cm initial water depth. The yield (both instantaneous
and cumulative) for the Western slope was averagely higher than that of the Eastern
slope.