Filtration System 1000. For pools up to 1000 gallons. Has a 12L x12Wx3H box filter, carbon and polyester media for mechanical/biological/chemical filtration. 3/4 tubing and fittings. Recommended pump up to 700 gallons. For example, can use the Praefecta Pond Pump 700 and select 3/4 tubing for attachment. Can connect more than one to a pump in more demand.