Most pools are designed to return port of a vacuum port. Vacuum port is only used the pool clean. These vacuum port to connect to the pool vacuum cleaner, its role is similar to an ordinary vacuum cleaner, but pumped water instead of air. Vacuum suction pump can bring their own mouth, but in most pools are driven by the main pump. Shanghai Xiang happy to serve you. . Thank you! Sand Cleaning recommendations: 1, high-temperature pool, spa pool cleaning sand tank once a month. 2, pool cleaning sand tank once a year. Features: 1, can eliminate Staphylococcus aureus, disinfectants use less. 2, completely remove dirt sand cylinder sludge suction hose AQUA pool, make long-term clean water. 3, avoid frequent water changes, saving water, but saving heating costs. 4, the lifting cylinder bitter sand sand sand compaction of AQUA Pool cylinder, for sand and more convenient. Usage and dosage; sand cylinder head open, hit the open net to put the water valve, close the drain valve, even after the drug is diluted with water splashing on the sand cylinder sand (with the same amount of water released) AQUA pool pumps, water to diffuse through the sand. Soak for 3-8 hours, and put on the sand head. Washing backwash 5-15 minutes 10-30 minutes, you can properly filtered. 900 sand cylinder usage 200g; 2000 sand cylinder usage 1.5-2kg (Bath recommendations from January to February cleaned once, pool cleaning once a year.) _ Shanghai Xiang swimming pool Sand Bath _AQUA provided by Shanghai Xiang bath. Shanghai Xiang Bath Equipment Co., Ltd. (www.shxsxy.com) in SPA Jacuzzi engineering, installation, engineering, installation pool, sauna engineering, installation and other industries have a higher profile, both business integrity, quality service, welcome to inquire, or consult Our "Business League call" it!