Anti-vortex, Virginia Graeme-Baker (VGB) Act-approved drain covers must be used to protect swimmers from being pulled by suction to the drain. Usually it is at the deepest point of the pool floor, the valve is located under the lid which sits at the bottom of the pool covering the main-drain. We've already seen that the water in a swimming pool needs to circulate through a filtering system, to remove dirt and debris. Reasons to Drain. Let's take a look at the language on swimming pool circulation and swimming pool drains for most of … Asked in Swimming Pools , Pool Building and Repair , Pool … If you have an operating bottom drain, remove the cover and see if it has a hydrostatic relief valve (almost all do), unscrew and remove the valve as soon as the pool is drained. The main thing a bottom drain does in a swimming pool is help the pool water circulate better and more evenly stabilize the water temperature. If your pool's TDS becomes too high, you might experience white stains on the walls from calcium deposits, brownish stains from excessive manganese, and salty water that can irritate swimmer's eyes and skin. If a pool has been left for a long time with standing water and it's too dirty to clean with chemicals or you have a leak that needs to be fixed, you will have to drain your pool. The main drain in pools is for circulating the lower part of the pool and is not intended to drain the pool as in a bath tub. Without a bottom drain… During winter months or periods of non-use, most pool drains do not need to be plugged, but in some cases plugging a main drain is required or recommended. The problem is that they can be very dangerous pieces of equipment in the pool, and that many pool owners don’t realize it. Emptying a Swimming Pool. How do I unclog suction (drain line) at bottom of my swimming pool? A pool drain cover should be replaced if worn or broken. Dirty water in the pool or a slight overflow can be the result of the excess pressure, which is a good … Then, you should connect the clean out pipe from the sump pump to the sewer, if your municipality allows that amount of drainage, or direct the water to irrigate your plants. The hydrostatic valve achieves this by allowing ground water to flow into the pool thereby relieving the pressure on the liner. Where To Drain A Pool. If you have a main drain on the bottom, just set the pump to pull only from the drain, and set the spider valve to waste. To drain and refill your swimming pool, start by renting a submersible sump pump from a home improvement store, if you don't already have one. The drain line (suction ) at the bottom of my inground pool does not seem to be pulling water through it. A simple enough question on the surface, but around here, we always dive deeper into a subject, so when we talk about how to drain a pool – first we want to explore why you would do such a thing, and then cover the when, where and what of draining a swimming pool. A build-up of ground water can apply surprising amounts of hydraulic pressure on structures such as swimming pools. Eventually, your pool's surface material might begin to … A main drain circulates the pool's water by pulling water off the bottom of the pool and sending it to the filter.