TDHCA's homeownership programs are designed for first time homebuyers or homebuyers who have not owned a home as their primary residence within the past three years. Potential homebuyers must also meet program income guidelines and program purchase price limits. Additional credit and underwriting guidelines may apply.
Most ultraviolet purification systems are combined with various forms of filtration, as UV light is only capable of killing microorganisms such as bacteria, viruses, molds, algae, yeast, and oocysts like cryptosporidium and giardia.ltraviolet Water Purification-UV. Ultraviolet water purification lamps produce UV-C or germicidal UV, radiation of much greater intensity than sunlight. Almost all of a UV lamp's output is concentrated in the 254 nanometers (nm) region in order to take full advantage of the germicidal properties of this wavelength.
UV radiation at 185 nm is used to generate ozone. The UV lamps for water treatment consist of specialized low-pressure mercury-vapor lamps that produce ultraviolet radiation at 254 nm, or medium-pressure UV lamps that produce a polychromatic output from 200 nm to visible and infrared energy.he effectiveness of germicidal UV depends on the length of time a microorganism is exposed to UV, the intensity and wavelength of the UV radiation, the presence of particles that can protect the microorganisms from UV, and a microorganismâs ability to withstand UV during its exposure.