APEC Ultimate RO-90
Score: 85/100
Waterdrop G2
Score: 88/100Rankings
The Waterdrop G2 is a compact, tankless under-sink RO system delivering 400 GPD with an exceptional 1:1 wastewater ratio. It features a space-saving design and optional remineralization, making it ideal for homes with limited cabinet space. However, it requires an electrical outlet and is restricted to indoor use.
The APEC Water Systems RO-90 Ultimate Series is a WQA-certified, 5-stage under-sink reverse osmosis filtration system designed to produce 90 gallons of ultra-pure water per day. It features a durable metal frame, US-made filters with extended lifespan, and a 4-gallon storage tank to support households of four or more people. It is ideal for daily drinking and cooking in areas with high contaminants like lead, arsenic, or fluoride.
| Attribute | | |
|---|---|---|
5 stages | 7 stagesbest | |
90 gallons per day | 400 gallons per daybest | |
100 percentbest | — | |
4 gallonsbest | 0 gallons | |
— | 10 countbest | |
12 monthsbest | — | |
| ↓ lower better | 5.25 inchesbest | 5.91 inches |
| ↓ lower better | 17.5 inches | 13.98 inchesbest |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Compliance & Safety(1) | ||
Certifications | WQA Gold Seal | NSF/ANSI 372, FCC |
Storage(1) | ||
Storage Tank Capacity (gallons) | 4 gallons | 0 gallons |
Maintenance(1) | ||
Filter Lifespan (months) | 12 months | 12-24 months |
Design(2) | ||
System Width (inches) | 5.25 inches | 5.91 inches |
System Height (inches) | 17.5 inches | 13.98 inches |
Power(1) | ||
Power Requirement | false | true |
Performance(4) | ||
Filtration Stages (stages) | 5 stages | 7 stages |
Daily Production Rate (gallons per day) | 90 gallons per day | 400 gallons per day |
Contaminants Removed (count) | null count | 10 count |
Feed Water Pressure (PSI) | 50 PSI | PSI |
Features(2) | ||
Remineralization | false | true |
Faucet Type | Chrome | Brushed Nickel |
Products in the top-left offer the best value (high score, low price).
Professional reviewers from sources like Lowe's and Home Depot highlight the RO-90's premium quality, WQA certification, and superior contaminant removal capabilities. They praise the durable metal construction, eco-friendly design, and the longevity of US-made filters, positioning the system as virtually maintenance-free with a crisp taste that outperforms bottled water.
Everyday users consistently praise the excellent water quality and taste, noting significant reductions in Total Dissolved Solids (TDS). Common themes include satisfaction with the easy installation process, the long lifespan of the filters, and the overall value for obtaining pure water for growing families.
Professional sources emphasize the system's efficiency and filtration effectiveness, highlighting the 400 GPD flow rate and 1:1 drain ratio as standout features.
The system maintains a 4.5-star rating, with common user praise focusing on fast water delivery, improved water quality, and the convenience of the space-saving design.
