|EXHIBIT 32.1                                                                                                                                                                                                                                                                                                                                                                                                                         
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|CERTIFICATION PURSUANT TO RULE 13a-14(b) OR                                                                                                                                                                                                                                                                                                                                                                                          
|RULE 15d-14(b) and 18 U.S.C. SECTION 1350,                                                                                                                                                                                                                                                                                                                                                                                           
|AS ADOPTED PURSUANT TO                                                                                                                                                                                                                                                                                                                                                                                                               
|SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002                                                                                                                                                                                                                                                                                                                                                                                        
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|In connection with the annual report of Capacitive Deionization Technology Systems, Inc. (the "Company") on Form 10-KSB for the year ended December 31, 2005 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, John Davies, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:
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|(1)       The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and                                                                                                                                                                                                                                                                                                      
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|(2)       The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.                                                                                                                                                                                                                                                                       
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|Date: April 14, 2006 | /s/  John Davies       
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|                     | Chief Executive Officer