Waterdrop sells two main families of under-sink RO systems — the G2 series and the G3 series. Here's how the two lines differ and which one you should be looking at.
The G3 series (G3P600, G3P800) is Waterdrop's current-generation system with full NSF certifications. The G2 series (G2, G2P600) is the prior generation and budget tier — fewer certifications, fewer filtration stages, lower price.
If you're buying a new Waterdrop system today, the G3P600 or G3P800 are the right choices. They carry the full NSF certification stack, have the most advanced filtration stages, and feature the smart faucet with TDS monitoring and filter life tracking.
The G2 and G2P600 are appropriate if you have a tight budget and understand you're getting fewer certifications. They're also relevant if you're replacing filters for an existing G2 system — note that G2 and G3 filters are NOT interchangeable.
G2 and G3 filters do not cross over. If you own a G3P600 or G3P800, buy filters labeled for the G3 series (WD-G3-CF, WD-G3-CB). If you own a G2 system, buy G2-specific filters. Confirm your model before ordering.
Waterdrop G3P600 (recommended) on Amazon →