觀無量壽佛經義疏 2.116

2.116

「『是為八功德水想，名第五觀。』」八功德，一輕、二清、三冷、四軟、五美、六不臭、七飲時調適、八飲已無患，不出色、香、味、觸四塵而已。

"‘This is the visualization of the water of eight qualities, termed the fifth contemplation.’" The eight qualities are: first, lightness; second, purity; third, coolness; fourth, softness; fifth, deliciousness; sixth, free of foul odor; seventh, soothing when drunk; eighth, causing no distress after drinking. They do not exceed the four sense-objects of form, scent, taste, and touch.