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.
Teacher:Students Ratios: Set the maximum number of students per each teacher permitted in a classroom. 1  Minimum ratio is 1:15 (New Mexico and New York)  Maximum ratio is 1:30 (South Carolina)