Floating pool underground pool might look like a solid fixed structure villa outdoor pool, but it is actually more like a ship that can float in the surrounding groundwater. When the pool without water, groundwater pressure can actually top the pool out of the ground. This is one of the underground storage tank required year-round reasons. That is, the pressure inside and outside of the pool to be substantially equal. Most modern underground drainage pipe near the main pool has a special hydrostatic pressure valve, in order to avoid damage to groundwater pressure tank. Simply put, if the groundwater pressure is large enough, it will push up the small floating blocks to open the pressure valve. When the pressure valve opens, groundwater into the pressure balance. Swimming pool lighting is now led lights, most pools are equipped with underwater lighting, partly for aesthetics, but mainly for the convenience of swimmers in the evening to see their own actions. In one of the most common design of underwater lighting, incandescent bulbs are packaged in waterproof lamps, lamps embedded in the wall of the pool grooves. Insulated wire access through a special sealing fixtures, the water out of the reach of conductive elements. Wires connected back to the room through a long tube (or place where power). Most of the long tubes are filled with water. Tube leaving enough excess wire. When you want to replace the lamp, the lamp can be pulled out grooves people swimming pool and out of the water. Some people use fiber optic lighting for the pool, instead of using the embedded incandescent. In this system, the light source need not reside in the actual water. Therefore, you will not encounter replace the lamp, waterproof electrical components and other issues. People swimming pool | Swimming | Shanghai Xiang Xiang bath toiletries provided by Shanghai. If you have any questions about this information or consultation, please contact us now! Our Company Name: Shanghai Xiang Bath Equipment Co., Ltd. (www.shxsxy.com) Contact: Manager Hu, or click on "Business League call" direct dialogue with us!