Oil was collected from water by using skimmers. In total 2,063 various skimmers were used.[3] For offshore, more than 60 open-water skimmers were deployed, including 12 purpose-built vehicles.[116] EPA regulations prohibited skimmers that left more than 15 parts per million (ppm) of oil in the water. Many large-scale skimmers exceeded the limit.[155] Due to use of Corexit the oil was too dispersed to collect, according to a spokesperson for shipowner TMT.[156] In mid-June 2010, BP ordered 32 machines that separate oil and water, with each machine capable of extracting up to 2,000 bbl/d (320 m3/d).[157][158] After one week of testing, BP began to proceed[159] and by 28 June, had removed 890,000 bbl (141,000 m3).[160]