APEC RO-90
#3 in With tankFull review
For buyers who want a certified, low-maintenance tank RO system with long-lasting filters.
Amazon $209.99$209.99
The APEC RO-90 is the better under-sink reverse osmosis system overall, rated 3.8 to 3.7. The APEC RO-90 leads on price. The APEC RO-90 costs $89.95 less ($209.99 vs $299.94).
APEC RO-Hi
#4 in With tankFull review
For cooks and families who fill pots and pitchers often and want a faster pour from a certified tank system.
Amazon $299.94$299.94
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the APEC RO-90 for price ($209.99 vs $299.94).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every with tank under-sink reverse osmosis system; a clear win is highlighted. How we rank explains each one.
| Factor weight | APEC RO-90 | APEC RO-Hi |
|---|---|---|
| Overall rating | 3.8/5 | 3.7/5 |
| Certification 25% | 100 certified to NSF/ANSI 58 | 100 certified to NSF/ANSI 58 |
| Filter cost 20% | 77 $73 a year in replacement filters | 77 $73 a year in replacement filters |
| Water wasted 15% | 50 drain ratio not published (neutral score used) | 50 drain ratio not published (neutral score used) |
| Output 10% | 80 90 gallons a day | 80 90 gallons a day |
| Price 15% | 72 $209.99 | 42 $299.94 |
| Warranty 15% | 0 1-year warranty | 0 1-year warranty |
Specifications
| APEC RO-90 | APEC RO-Hi | |
|---|---|---|
| Filtration | ||
| Output | 90 gallons a day | 90 gallons a day |
| Stages | 5 | 5 |
| Remineralization | No | No |
| NSF/ANSI 58 | Yes | Yes |
| Other certifications | NSF/ANSI 372 | NSF/ANSI 372 |
| Replacement filters | $73 a year | $73 a year |
| Build | ||
| Tank | 4 gal | 4 gal |
| Booster pump | No | No |
| Smart faucet | No | No |
| Warranty | 1 year | 1 year |