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Feeder:
Mechanism that applies or distributes chemicals to swimming pools and spas (See Chlorinator/Brominator and Chlorine/Bromine Feeder). Product suggestions: Above-Ground In-Line Chlorinator, Floating Derby Duck Chlorinator, Large Chlorinator.
Fill Water:
Used when filling or adding to the pool or spa's water level. Whether from the hose or from a well, your fill water adds a different chemical make up and water balance (or lack thereof).
Filter:
Pool Filter is a device that removes solid particles and debris from pool water by circulating water through a porous substance or surface.
Cartridge Filter: Uses a porous element and is disposable.
Diatomaceous Earth Filter: Utilizes a thin layer of diatomaceous earth as its filter medium that periodically must be replaced.
Permanent-medium Filter: Uses a permanent substance like sand that under normal circumstances, will not have to be replaced.
Vacuum Filter: Uses suction from a pump to filter through a vacuum.
Filter Agitation:
A mechanical or manual movement to dislodge the filter dirt and aid from the filter element.
Filter Cycle:
The time it takes a filter to clean or backwash the pool water.
Filter Element:
A device within a pool filter that traps solids and conducts water back to the pool or spa. An element usually includes laterals, a septum, septum support, or a cartridge.
Filter Medium:
Finely graded material that removes particles from the pool water. Variations include sand, DE, or polyester fabric.
Filter Pump:
The device that pulls water from the pool and pushes it through the pool filter on its way back to the pool. Product suggestions: Sta-Rite Pump, Hayward Super Pump.
Fingers:
Thin flexible tubes that are placed vertically on a DE filter grid. They are coated with a thin "sock", and then with DE medium.
Foaming:
A term used to describe surface foam on your pool water, especially in spas/hot tubs. Foaming is caused by high TDS levels working in combination with soft water and oils. Use enzymes for foam control. Note: Certain low grade algaecides can foam when added to your pool or spa.
Free Chlorine:
The portion of chlorine that is actually available to kill bacteria in the pool. This does not include chloramines or chlorine used up by the sun's rays.