( ( This output ) ( ( ( is then ) ( used ( as ( ( the ( clean water ) ) ( for ( the ( toilet ( flushing system ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN output)) (VP (VBZ is) (ADVP (RB then)) (VP (VBN used) (PP (IN as) (NP (NP (DT the) (JJ clean) (NN water)) (PP (IN for) (NP (DT the) (NN toilet) (VBG flushing) (NN system))))))) (. .)))
This output is then used as the clean water for the toilet flushing system.
(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))))))) (. .)))