A method and apparatus for preparing a bone graft composite using an infusion chamber. A modular tube having a porous material contained therein and having removable end caps is provided. Bone marrow aspirate or other bone morphogenic protein containing suspensions may be infused into the tube. A filter on one end of the tube prevents the fluid from escaping while permitting air to be expelled from the tube as it is filled with bone marrow aspirate. Once infused into the tube, the bone marrow aspirate is allowed to settle to a putty or paste-like consistency, the putty and material together forming a bone graft composite.