The GC series was first initiated by Waterdance in the world. It is an intelligent exterior-cycling filter combining the pump room, filter, and disinfector together, suitable for different kinds of large or medium size swimming pools as well as the constant temperature pool. Because its water circulation reaches the purify standard of the international competition swimming pool, it can offer purify service to the stadiums, schools, and high-class clubs and contributes to the intrnstional sports business. This series has gotten several patents in the country. The GC series is suitable for leisure swimming pools, club swimming pools, competition swimming pools and training swimming pools. The GC series is the outside equipment which should be installed at an empty place near the poolside, so it can save the cost of building pump room. At the same time, the filter can meet the demand of the international developed countries. By providing both regular current and counter current, the distribution of the current can reach best condition so as to ensure the cleanliness of pool water and raise the filtration efficiency.