This question must be pertaining to other companies selling and promoting outdated older ceramic based filter systems, specifically “Black Ceramic” filters, where they claim that red colored water suffices for an actual test. This so called water test is used to check for internal filter damage, due to their fragile design, prone to hairline fractures and easily damaged.
The Dry Element, “Nano Gravity Water Purification Filter is based on a superior more advanced Electro Positive Filtration - Sub Micron Filtration - Carbon Impregnated - Silver Infused Nano Ionic fabric technology, which is also used by NASA. Our filter has even been certified by the Space Foundation. Therefore a red color water test Does Not apply to this technology and is typically sold as a subjective test for ceramic based gravity-fed water filters.
Note, such a test is not used in the real world test labs certified by the EPA, WHO, etc. The only conclusive way to really test all water filters regarding what they remove or reduce is to have a real world certified lab test subject to EPA and WHO standards. The Dry Element, “Nano Gravity Water Filter”, Exceeds EPA and the World Health Organization's protective standards for removal of virus, bacteria and cysts.
Ironically, one such company that sells gravity-fed systems based on the “Black Ceramic Filter” technology states the following in their Operation Booklet of the product: “If you suspect the water source contains viral and bacteriological contamination, as a precaution you may add 16- drops of plain bleach or iodine to each 1-gallon of water and wait 30 minutes in order to pre-treat the water before purifying in this system.” So how effective is the red food color test in proving that such a filter is actually removing pathogens, etc?