What is the Difference between the Two Kold Ster-il® Systems?

The small system uses ten inch canisters (clear), ¾" Npt. Threaded fittings, flows 3.8 Gpm (14.3Lpm) for approximately 5,000 gallons (18925 L.). The smaller system can provide lower lead, mercury, cadmium levels due to the addition, into the carbon cartridge, of a highly selective charged ceramic. The larger system uses twenty inch canisters (blue sump) 1 ½" Npt. Threaded fittings, flows 14-20 Gpm (75.7 Lpm) for 150,000 gallons (567750 L) and it's last state 0.50 µm Carbon (size: 4" diameter x 20" length) doesn't contain a charged ceramic. However, the discs are much larger (30) 3 ¾" and it's filter bag 4" x 18 ½" is also much larger. The larger system replacement media costs hundreds of dollars but capable of providing water for $0.002 per gallon or less for commercial usage.