( ( Ultra-low ( flush toilets ) ) ( ( use ( ( half ( the water ) ) ( of ( conventional toilets ) ) ) ) . ) )
(ROOT (S (NP (JJ Ultra-low) (JJ flush) (NNS toilets)) (VP (VBP use) (NP (NP (PDT half) (DT the) (NN water)) (PP (IN of) (NP (JJ conventional) (NNS toilets))))) (. .)))
Ultra-low flush toilets use half the water of conventional toilets.
(ROOT (S (NP (NP (DT The) (NN action)) (PP (IN of) (S (VP (VBG flushing) (NP (DT the) (NN toilet))))) (, ,) (VP (VBN performed) (NP (JJ multiple) (NNS times)) (ADVP (RB daily))) (, ,)) (VP (VBZ is) (NP (NP (DT the) (ADJP (JJ single) (JJS biggest)) (NN use)) (PP (IN of) (NP (NP (NN water)) (PP (IN in) (NP (DT the) (NN home))))))) (. .)))