The bladed member of the rotating assembly of the pump which applies the principal force to the liquid being pumped.
INFLUENT
The inflow or entering water to a filter or other device.
INLET
The fitting through which the filtered water passes to the pool (filtered water inlet), or the fitting through which raw water passes to the pool (raw water inlet).
IODINE
An element related to chlorine and bromine used as a disinfectant, both in its natural solid form and in iodide compounds. When iodides are used, chlorine is normally employed to free the elemental iodine.
ION
An atom or molecule having either a positive or negative electrical charge. Positively charged ions are referred to as cations and ions having a negative charge are termed anions.
ION EXCHANGE
A process by which certain ionized chemicals present in water are replaced with other ionized chemicals temporarily attached to resin particles. The exchange process is made only for ions having the same charge.
IRON
A very common element often present in ground water in amounts ranging from 0.01 to 10.0 ppm(mg/l). Iron may be found in three forms: in soluble forms such as in ferrous bicarbonate; bound with a soluble organic compound; or as suspended ferric iron particles. Iron above 0.3 mg/l is objectionable to water because of staining of laundry and plumbing fixtures.
IRON BACTERIA
Bacteria which thrive on iron and are able to actually use ferrous iron (as found in water or steel pipes) in their metabolic processes to incorporate ferric iron in their cell structure and to deposit gelatinous ferric hydroxide iron compounds in their life processes.