( ( This ( percolation process ) ) ( ( helps ( ( clean ( the water ) ) ( before ( it ( reaches ( the ( underground ( storage basin ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN percolation) (NN process)) (VP (VBZ helps) (VP (VB clean) (NP (DT the) (NN water)) (SBAR (IN before) (S (NP (PRP it)) (VP (VBZ reaches) (NP (DT the) (JJ underground) (NN storage) (NN basin))))))) (. .)))
This percolation process helps clean the water before it reaches the underground storage basin.
(ROOT (S (NP (NP (NNP Process)) (PP (IN of) (NP (NN desalinization)))) (VP (VBZ helps) (VP (VB provide) (NP (JJR cleaner) (NN water)) (PP (IN for) (NP (NN agriculture))))) (. .)))