Refers to the low-pressure condition created in the suction line. Also refers to the cleaning process of sucking leaves, algae and debris from the pool floor.
A device placed in the plumbing line which restricts or obstructs water flow to create desired hydraulics, or may permit flow in one direction only (as in a check valve).
Increasing water velocity by restricting pipe size usually accomplished by a spa jet.
A natural mineral that expands with the application of heat. The expansion process is called exfoliation and it is routinely accomplished in purpose-designed items. Vermiculite is formed by hydration of certain basaltic minerals.
One type of interior pool finish. The liner is draped over a sand or hard bottom floor, and locked into the top of the pool wall. It is the vinyl membrane that acts as the container to hold or contain the water.
A volute is a curved funnel increasing in area to the discharge port. It is often used with impeller pumps. As the area of the cross-section increases, the volute reduces the speed of the liquid and increases the pressure of the liquid. One of the main purposes of a volute casing is to help balance the hydraulic pressure on the shaft of the pump; however, this occurs best at the manufacturer's recommended capacity. Running volute-style pumps at a lower capacity than the manufacturer recommends can put lateral stress on the shaft of the pump, increasing wear-and-tear on the seals and bearings, and on the shaft itself.