WaterChefÂ® Premium Countertop Filter Cartridges. Combining the power of solid carbon block filtration with a unique, proprietary blend of additional filter medias, WaterChefâs innovative Big Blockâ¢ Filtration technology maximizes contaminant reduction and delivers up to 1,000 GALLONS (3,785 L) of freshly filtered water with a single cartridge!
Definition provided by Wikipedia. Student-teacher ratio refers to the number of teachers in a school or university with respect to the number of students who attend the institution. For example, a student teacher ratio of 10:1 indicates that there are 10 students for every one teacher. The term can also be reversed to create a teacher-student ratio.
A measure of the portion of a population which is composed of dependents (people who are too young or too old to work). The dependency ratio is equal to the number of individuals aged below 15 or above 64 divided by the number of individuals aged 15 to 64, expressed as a percentage.