The State of Florida reports that it has spent more than $2 billion on the various projects since CERP was signed. More than 36,000 acres (150 km2) of Stormwater Treatment Areas (STA) have been constructed to filter 2,500 short tons (2,300 t) of phosphorus from Everglades waters. An STA covering 17,000 acres (69 km2) was constructed in 2004, making it the largest environmental restoration project in the world. Fifty-five percent of the land necessary for restoration, totaling 210,167 acres (850.5 km2), has been purchased by the State of Florida. A plan named "Acceler8", to hasten the construction and funding of the project, was put into place, spurring the start of six of eight construction projects, including that of three large reservoirs.[78]