background, clean, clear, cold, concept, conservation, cool, desalination, drink, ecology, environment, faucet, flowing, industrial, industry, liquid, metal, motion, nature, old, outdoor, outside, park, pipe, pollution, quality, steel, tap, thirsty, waste, water, wet, wetness, improvement, low temperature, pat, impurity, composure, tube, mechanism, passage, aplomb, moisture, transformation, conduit, mixture, disposition, temperature, sound, flow, regulator, environmental condition, coldness, alloy, situation