iSpring RO500AK
#10 in TanklessFull review
For buyers who want a certified tankless system with remineralization and fast flow. Running costs are high, so it suits households that value the certification over cheap filters.
Amazon $625.06$625.06
3.1/5
For a household that wants fast mineralized RO water with low filter costs and does not need NSF 58 certification.
- 800 gallons a dayOutput
- 2:1Pure to drain
- $119 a yearFilters
- NoNSF/ANSI 58
Check price at Amazon$509.98
Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Cheap filters for an 800 gallon a day system, about $119 a year
- Adds minerals back for better tasting water
- The faucet shows water TDS and filter status
Cons
- Not certified to NSF/ANSI 58 despite the marketing
- Warranty length not published
- Needs a power outlet under the sink
The Frizzlife PD family
Every Frizzlife PD model we rank, smallest first. Ratings compare each against its own type.
| Model | Output | Rating | Price |
|---|---|---|---|
| Frizzlife PD600-TAM3 | 600 gallons a day | 3.1/5 | $399.49 |
| Frizzlife PD800-TAM4 (this one) | 800 gallons a day | 3.1/5 | $509.98 |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | PD800-TAM4 |
|---|---|
| Filtration | |
| Output | 800 gallons a day |
| Pure to drain | 2:1 |
| Stages | 9 |
| Remineralization | Yes |
| NSF/ANSI 58 | No |
| Other certifications | NSF/ANSI 372 |
| Replacement filters | $119 a year |
| Build | |
| Tank | Tankless |
| Booster pump | Yes |
| Smart faucet | Yes |
Alternatives in this type
Frizzlife PD600-TAM3
#11 in TanklessFull review
For a buyer who wants mineralized tankless RO with low running costs and accepts maker test claims instead of NSF 58 certification.
Amazon $399.49$399.49
Philips AUT9360
#13 in TanklessFull review
For a buyer who wants a two-filter tankless system with a longer warranty and lower water waste, and can live without NSF 58 certification.
Amazon $349.98$349.98
Compare
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