Waterdrop G3P800 Review (2026): More Speed, More Stages — But Is It Worth the Upgrade?

The G3P800 upgrades the G3P600 with 200 extra GPD and 2 more filtration stages. It's faster. It's more thorough. But the waste ratio goes in the wrong direction. Here's the full picture.

Our verdict

Great system — but most households should save the money and buy the G3P600

The G3P800 fills a cup in 5 seconds vs the G3P600's 8. It has 10 stages vs 8. But its waste ratio is 3:1 vs G3P600's 2:1 — meaning it wastes 50% more water per gallon produced. Unless you have very high household demand or want the absolute fastest flow, the G3P600 is the smarter buy.

G3P800 vs G3P600: the key numbers

Feature	G3P600	G3P600
Flow rate	800 GPD — 1 cup in ~5 seconds	600 GPD — 1 cup in ~8 seconds
Pure-to-drain ratio	3:1 (higher waste)	2:1 (more efficient)
Filtration stages	10 stages	8 stages
Certifications	NSF/ANSI 42, 53, 58, 372	NSF/ANSI 42, 53, 58, 372
Smart faucet	Yes — LED filter indicator	Yes — LED filter indicator
Filter replacement	3 seconds, no tools	3 seconds, no tools
Remineralization	Not included (add-on available)	Not included (add-on available)
Electricity required	Yes	Yes

When the G3P800 makes sense

Your household uses a very high volume of RO water daily (2+ gallons)
You want the fastest possible on-demand flow for a busy kitchen
You're connecting the system to a coffee machine, ice maker, and drinking water simultaneously
The 3-second difference per cup feels meaningful to you

When the G3P600 is the better choice

You want the most water-efficient under-sink RO (2:1 vs 3:1 is a real difference over a year)
Your household uses less than 1.5 gallons of RO water per day
You want to save money — the G3P600 typically costs $50–$100 less

The waste ratio issue explained

At 3:1, the G3P800 wastes 3 gallons for every 1 it purifies. The G3P600 at 2:1 wastes 2. For a household using 1 gallon per day, that's 365 more gallons wasted annually with the G3P800. Over five years: 1,825 extra gallons down the drain. If you're on metered water or care about conservation, this is a meaningful consideration.