A dual chamber cardiotomy reservoir (1115a and 1115b) for removing air from venous blood during cardiopulmonary bypass, the dual chamber cardiotomy reservoir comprising: a. a clean blood chamber that filters and removes air bubbles out of clean blood having: i. a first vertical wall; ii. an inlet port; iii. an outlet channel in fluid communication with the chamber to remove air from venous blood; iv. a filter to remove air bubbles out of the clean blood, the filter including a defoamer interposed between the inlet port and the outlet channel of the clean blood chamber and; b. a sucker blood chamber that filters and removes air bubbles out of sucker blood, the sucker blood chamber having: i. a second vertical wall; ii. an inlet port; iii. an outlet; iv. an aggressive sucker filter, that includes a sucker defoamer, to remove air out of sucker blood and filter the sucker blood, the aggressive sucker filter interposed between the inlet port and the outlet of the sucker blood chamber; v. a means to allow the end user to open or close the sucker outlet; c. a chamber comprising an inlet chamber and an outlet chamber, to remove air from venous blood comprising: i. a vertical wall; ii. an inlet port; iii. an outlet port; iv. a screen interposed between the inlet port and the outlet port of the chamber, the screen forming an outside wall of the inlet chamber and an inside wall of the outlet chamber and forming a fluid communication between the inlet port and the outlet port of the chamber; v. a blood defoamer to collapse venous blood foam; d. an air exhaust port in fluid communication with the ambient atmosphere, wherein the clean blood chamber is separate from the sucker blood chamber allowing a user to deaerate the clean blood prior to the clean blood combining with the venous blood without the clean blood contacting the aggressive sucker filter or the sucker blood. a. a clean blood chamber that filters and removes air bubbles out of clean blood having: i. a first vertical wall; ii. an inlet port; iii. an outlet channel in fluid communication with the chamber to remove air from venous blood; iv. a filter to remove air bubbles out of the clean blood, the filter including a defoamer interposed between the inlet port and the outlet channel of the clean blood chamber and; i. a first vertical wall; ii. an inlet port; iii. an outlet channel in fluid communication with the chamber to remove air from venous blood; iv. a filter to remove air bubbles out of the clean blood, the filter including a defoamer interposed between the inlet port and the outlet channel of the clean blood chamber and; b. a sucker blood chamber that filters and removes air bubbles out of sucker blood, the sucker blood chamber having: i. a second vertical wall; ii. an inlet port; iii. an outlet; iv. an aggressive sucker filter, that includes a sucker defoamer, to remove air out of sucker blood and filter the sucker blood, the aggressive sucker filter interposed between the inlet port and the outlet of the sucker blood chamber; v. a means to allow the end user to open or close the sucker outlet; i. a second vertical wall; ii. an inlet port; iii. an outlet; iv. an aggressive sucker filter, that includes a sucker defoamer, to remove air out of sucker blood and filter the sucker blood, the aggressive sucker filter interposed between the inlet port and the outlet of the sucker blood chamber; v. a means to allow the end user to open or close the sucker outlet; c. a chamber comprising an inlet chamber and an outlet chamber, to remove air from venous blood comprising: i. a vertical wall; ii. an inlet port; iii. an outlet port; iv. a screen interposed between the inlet port and the outlet port of the chamber, the screen forming an outside wall of the inlet chamber and an inside wall of the outlet chamber and forming a fluid communication between the inlet port and the outlet port of the chamber; v. a blood defoamer to collapse venous blood foam; i. a vertical wall; ii. an inlet port; iii. an outlet port; iv. a screen interposed between the inlet port and the outlet port of the chamber, the screen forming an outside wall of the inlet chamber and an inside wall of the outlet chamber and forming a fluid communication between the inlet port and the outlet port of the chamber; v. a blood defoamer to collapse venous blood foam; d. an air exhaust port in fluid communication with the ambient atmosphere, wherein the clean blood chamber is separate from the sucker blood chamber allowing a user to deaerate the clean blood prior to the clean blood combining with the venous blood without the clean blood contacting the aggressive sucker filter or the sucker blood.