Interior cycling series(GB25,GD25) Applicability: The interior cycling series filters are especially suitable to the customer whose swimming pool has already set for these filters have been integrated with the wall of the swimming pool and without the pre-buried underground pipeline. In addition, they have beautiful and exquisite appearance. This kind of filters devote to all kinds of medium-size and small swimming pools and private pools whose total area is less than 200m3 . Design: This kind of filters are suitable to family use for the reason that there?s no need to build the pump room and pre-bury the pipeline while their filtration effect is superior to the traditional filter. In addition, it?s very easy to install and use.