The most common pool and hot tub water tests are: Algae can harbor bacteria and can be slippery. The vacuum ports may bottom of the pool their own pumping system, but in most pools they are driven by the main pump. Share Flipboard Email. Also protects water from the effects of the sun.
Skip to main content. An overflow trough at the edge of the pool through which floating debris, oil and other "lighter-than-water" things flow. This line keeps the skimmer from drawing air into the pump system if the water level drops below the level of the main inlet. If you do tackle your leaf issue with a leaf rake, make sure you don't scratch or pierce the liner if your pool requires one.