Waterdrop G6A8 Tankless Reverse Osmosis System, 8-Stage, 800 GPD

For drinking water, cooking, and filling bottles at the kitchen sink, the Waterdrop G6A8 combines reverse osmosis filtration with a compact, tankless under-sink design. Its 8-stage system is rated for up to 800 GPD, while the slim footprint helps preserve cabinet space for everyday kitchen essentials.

A mineral infusion layer adds calcium, magnesium, sodium, and potassium back into purified water, with a stated pH of around 7.5. That added mineral profile is designed to complement water used for coffee, tea, and home-cooked meals.

Why it makes sense

Traditional tank-style RO systems use a storage tank beneath the sink, the G6A8 takes a tankless approach. Its dimensions are 15.94"L x 5.31"W x 9.61"H, making the unit suited to kitchens where cabinet organization matters. The system is designed for under-sink installation and uses fewer water connections than traditional tank RO systems, which can simplify a DIY setup.

Eight filtration stages and a 0.0001 μm RO membrane support everyday water treatment. SGS testing reports reduction of up to 99% of contaminants, including chlorine, fluoride, heavy metals, TDS, nitrate, and chromium. The system is also certified by IAPMO R&T to NSF/ANSI/CAN 372 for lead-free materials. These details make it easier to assess the filtration approach when choosing an under-sink system for drinking and cooking water.

What matters most

The stated flow rate is up to 800 gallons per day, giving the system a fast-flow design for routine kitchen use. Its pure-to-drain ratio is described as 3:1 in the product highlights, the manufacturer description also lists a different ratio, so that figure is not used here as a buying measure.

Mineral infusion is a distinctive part of this model: after reverse osmosis filtration, the system adds Ca²⁺, Mg²⁺, Na⁺, and K⁺ back into the water. This can be relevant for households that want an RO system with mineral-enriched water for beverages and meal preparation, rather than a filtration setup focused only on the RO process.

Tips for day-to-day use

The G6A8 includes a mechanical faucet, a user manual, and two pre-installed filters. For routine upkeep, its twist-and-pull filter design is intended to make replacement straightforward. Built-in light and beep reminders indicate when it is time to replace a filter, helping keep maintenance visible as part of regular kitchen use.

Plan the under-sink placement around the unit’s listed dimensions and the connections needed for installation. The compact, tankless format can leave more cabinet room available for items such as cleaning supplies or kitchen essentials, while the included faucet provides a dedicated dispensing point at the sink.

Questions before you buy

What is included with the system? The listed components are the G6A8 RO system with two pre-installed filters, a mechanical faucet, and a user manual.

How does filter replacement work? The filters use a twist-and-pull design, and the built-in beep and light reminders signal when replacement is due. The described replacement process can take as little as three seconds.

What kind of installation is it designed for? This is an under-sink system. Its tankless design and reduced number of water connections are intended to make DIY installation easier than with traditional tank RO systems.

When it makes sense

The Waterdrop G6A8 is suited to kitchens looking for under-sink reverse osmosis filtration without a storage tank, especially when cabinet space is a consideration. Its 8-stage treatment, mineral infusion, high stated flow rate, and filter reminders bring together practical details for everyday drinking, cooking, and beverage preparation.