F
Float Valve - Valve at the bottom of a skimmer to control the water flow.
G
Gas Heater - Spas and heated pools require a large heater to quickly heat the large volume of water necessary. These are fueled by propane or natural gas and are often the most expensive piece of equipment
Gate Valve - Valve that twists on and off lower or raising a gate internally.
Grid - Can be call grid or filter element. Device inside a dE filter that is coated with DE powder and traps particles in the water.
Gunite - A type of concrete that is applied with a sprayer to form the pool shell. It can also be used to form slides, waterfalls, pads, and other features.