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.
Uvc, at 200 to 280 nm, which is the most energetic and most damaging but least prevalent of the uv radiation types, is totally absorbed by ozone and normal diatomic oxygen high in the atmosphere. Ozone is most effective at absorbing radiation at the 250 nm wavelength. In fact, it is 100 times more efficient at 250 nm than it is at 350 nm. After ozone absorbs this shortwave radiation, it reradiates it at generally longer wavelengths which initially goes in all directions.