( ( ( ( Not ( to ( be ( indelicate ( about it ) ) ) ) ) -- ) ( but ( ( the ( poor performance ) ) ( has ( convinced ( ( many people ) ( they ( must ( flush ( ( two ( or ( three times ) ) ) ( per ( ( use , ) ( which ( negates ( ( the ( water savings ) ) ( ( the toilets ) ( are ( supposed ( to provide ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (RB Not) (VP (TO to) (VP (VB be) (ADJP (JJ indelicate) (PP (IN about) (NP (PRP it))))))) (: --) (S (CC but) (NP (DT the) (JJ poor) (NN performance)) (VP (VBZ has) (VP (VBN convinced) (NP (NP (JJ many) (NNS people)) (SBAR (S (NP (PRP they)) (VP (MD must) (VP (VB flush) (NP (NP (CD two) (CC or) (CD three) (NNS times)) (PP (IN per) (NP (NP (NN use)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ negates) (NP (NP (DT the) (NN water) (NNS savings)) (SBAR (S (NP (DT the) (NNS toilets)) (VP (VBP are) (VP (VBN supposed) (S (VP (TO to) (VP (VB provide))))))))))))))))))))))) (. .)))
Not to be indelicate about it -- but the poor performance has convinced many people they must flush two or three times per use, which negates the water savings the toilets are supposed to provide.
(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))))))) (. .)))