University of the OFS, P.O. Box 339, Bloemfontein 9300

Tel 051 401 2394 Fax 051 447 3541

16.11.1999

TO WHOM IT MAY CONCERN

This serves to stipulate that the Institute for Groundwater Studies at the University of the Orange Free State has been involved in the evaluation of the Aqua Correct AC55029 over the period 17 June - 20 October 1999.

Experimental setup:

• A heating element that has been operation for approximately 1 year was taken from geyser at the University.
• All lime deposits was cleaned from its tip by submersing it in diluted HCl.
• The heating element was replaced in the same geyser for a period of three month
• The Aqua Correct AC55029 unit was installed at the water inlet to the geyser.
• Chemical Analyses of water before entering the Aqua Correct AC55029 and thereafter was done on a monthly basis. The results are presented in Table 1. The conclusion is drawn that there is no significant change in the water chemistry before and after the unit.
• After three months, the heating element was removed from the geyser and inspected visually. Figure 1 - 3 provide comparisons of the heating element before and after the experiment.
• The conclusions are drawn that
• Fresh lime precipitation that did occur on the tip of the element during the three months period did not bind to the metal (Figure 1) and could be removed by rubbing across it by hand.
• Lime precipitation which was present on the untreated portion of the element, has been removed (Figure 2) and there was no difference between the acid treatment and the treated portions of the element.
• It is clear that the existing lime precipitate has been removed within the three months over which the element has been tested and that no additional precipitation has formed which could bound to the metal element.

Yours sincerely