Buffered cocopeat is cocopeat which has been treated with calcium nitrate.
Buffering cocopeat ensures that the sodium and potassium ions inherent to the cocopeat complex are washed away. When buffering cocopeat with calcium nitrate, the ion exchange, as we call the process where calcium pushes the other ions off the complex, has already taken place and other elements, such as sodium and potassium have been washed away. This is done to ensure that once the grower starts fertilizing with calcium, the calcium is available to the plant.
Progrow offers buffered cocopeat on request.