Filtration Systems / Purifiers Model: GFS5000 Flow Rate: 5000 LPH (1321 GPH) Model: GFS5000DM Flow Rate: 10000 LPH (2642 GPH) Model: GFS3000DM Flow Rate: 6000 LPH (1585 GPH) Model: GLS5000 Flow Rate: 5000 LPH (1321 GPH)