Same brand, same design, same 3-second filter replacement. The G3P600 and G3P800 differ in three ways: speed, stages, and waste ratio. Here's which one to buy.
The G3P800 is faster (5 seconds per cup vs 8) and has more filtration stages. But it wastes more water per gallon (3:1 vs 2:1) and costs more. For the vast majority of households, the G3P600 is faster than you'll ever need and more water-efficient. The G3P800 upgrade makes sense only for very high-demand households.
At 2:1, the G3P600 wastes 2 gallons for every 1 purified. At 3:1, the G3P800 wastes 3. That's 50% more water waste per gallon of drinking water. Over a year at 1 gallon/day use: G3P600 wastes ~730 gallons, G3P800 wastes ~1,095 gallons — 365 gallons more per year down the drain.
8 seconds vs 5 seconds per cup. At 600 GPD the G3P600 produces 0.42 gallons per minute. In practice, you'll never wait for water — both systems are fast enough that the difference is imperceptible for normal household use. Only in commercial or very high-volume situations does 800 GPD vs 600 GPD make a noticeable practical difference.
Buy the G3P600. Better waste ratio, lower price, and more than enough speed for any household. Upgrade to the G3P800 only if you have 4+ people all drawing RO water simultaneously, or if you're connecting the system to multiple appliances that run concurrently.
Waterdrop G3P600 on Amazon →Waterdrop G3P800 on Amazon →