One month after the oil rig explosion in the Gulf of Mexico that led to a massive, ongoing oil spill, BP announced Thursday that it is collecting 5,000 barrels of the leaking oil daily. This is the admission from BP that its earlier estimates of the size of the spill were too small,  The Washington Post reports.

The oil is being captured from one of two leaks in the well on the sea floor. The leak that remains open is the smaller of the two and accounts for about 15 percent of the total flow, according to BP, which was leasing the exploded rig.

Also on Thursday, the Environmental Protection Agency told BP it must change the chemical dispersants used to break up the oil underwater and on the surface. A total of about 655,000 gallons of the chemical dispersants Corexit 9500A and Corexit 9527A have been sprayed into the Gulf of Mexico. This is the largest amount of dispersant ever used, and the EPA is responding to growing concern that the chemicals’ effect on marine life of the gulf have not been taken into account.

Certain types of Corexit were banned in Britain more than a decade ago, and BP has already ordered 60,000 gallons of a more environmentally friendly dispersant.