|EXHIBIT 31.2                                
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|CERTIFICATION PURSUANT TO SECTION 302 OF THE
|SARBANES-OXLEY ACT OF 2002                  
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|I, Phil Marshall, certify that:             
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|1. | I have reviewed this quarterly report on Form 10-KSB of Capacitive Deionization Technology Systems, Inc.;                                                                                                                                                                                                                                                                                                                                    
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|2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;                                                                                                                                   
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|3. | Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of Capacitive Deionization Technology Systems, Inc. as of, and for, the periods presented in this report;                                                                                                                    
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|4. | Capacitive Deionization Technology Systems, Inc.'s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for Capacitive Deionization Technology Systems, Inc. and have:                                                                                                                                           
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|   | (a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to Capacitive Deionization Technology Systems, Inc., including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;                         
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|   | (b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;                                                                  
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|   | (c) Evaluated the effectiveness of Capacitive Deionization Technology Systems, Inc.'s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and                                                                                                                    
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|   | (d) Disclosed in this report any change in Capacitive Deionization Technology Systems, Inc.'s internal control over financial reporting that occurred during Capacitive Deionization Technology Systems, Inc.'s most recent fiscal year that has materially affected, or is reasonably likely to materially affect, Capacitive Deionization Technology Systems, Inc.'s internal control over financial reporting; and                        
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|5. | Capacitive Deionization Technology Systems, Inc.'s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to Capacitive Deionization Technology Systems, Inc.'s independent registered public accounting firm and the audit committee of Capacitive Deionization Technology Systems, Inc.'s board of directors (or persons performing the equivalent functions):
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|   | (a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect Capacitive Deionization Technology Systems, Inc.'s ability to record, process, summarize and report financial information; and                                                                                                                              
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|   | (b) Any fraud, whether or not material, that involves management or other employees who have a significant role in Capacitive Deionization Technology Systems, Inc.'s internal control over financial reporting.                                                                                                                                                                                                                             
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|Date: May 12, 2006 | /s/  Phil Marshall     
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|                   | Chief Financial Officer