( ( The ( blue product ) ) ( ( not only ) ( ( is ( used ( ( ( ( to ( ( make ( ( ponds and ) lakes ) ) bluer ) ) , ) but ) ( to ( ( ( block ( sunlight ( in water ) ) ) , ) ( thus ( reducing ( algae growth ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (JJ blue) (NN product)) (ADVP (RB not) (RB only)) (VP (VBZ is) (VP (VBN used) (S (VP (VP (TO to) (VP (VB make) (NP (NNS ponds) (CC and) (NNS lakes)) (ADVP (RB bluer)))) (, ,) (CC but) (VP (TO to) (VP (VB block) (NP (NP (NN sunlight)) (PP (IN in) (NP (NN water)))) (, ,) (S (ADVP (RB thus)) (VP (VBG reducing) (NP (JJ algae) (NN growth)))))))))) (. .)))
The blue product not only is used to make ponds and lakes bluer, but to block sunlight in water, thus reducing algae growth.
(ROOT (S (NP (DT A) (JJ blue) (NN block)) (VP (VBZ appears) (ADJP (JJ blue) (PP (IN in) (NP (DT the) (NN sunlight)))) (SBAR (IN if) (S (NP (RB only) (JJ blue) (NN light)) (VP (VBZ is) (VP (VBN reflected) (PP (IN by) (NP (DT the) (NN block)))))))) (. .)))