Salt-free conditioner · checked 16 Oct 2026
Watts OneFlow Residential Anti-Scale System, 12 GPM with Smart…
Model OFRES-0935-K · replacement filter OFRES-0935RM
Lead:not claimedPFAS:not claimed
Each claim, checked
What the brand says, what a certification listing shows for this model, and where each fact comes from. We read listings; we do not test products.
- Certified (listing checked)The certifier’s public listing shows this claim for this model.
- Brand says certifiedThe brand says certified; IAPMO’s listing does not show it. NSF can be checked by hand.
- Brand claim onlyThe brand claims it without citing a certification.
| Contaminant | Brand claim | Standard | Certifier | Confirmed? | Source, date checked |
|---|---|---|---|---|---|
| Scale | “Independent scientific testing has confirmed Media-assisted crystallization (MAC) technology provides scale reduction of over 95+%.” brand source | DVGW W512 | – | Brand claim — no certification cited | brand pagechecked 16 Oct 2026 |
Filter changes, by the brand’s numbers
How often Watts says to replace each part. Real filter life depends on how much water you use and what is in it.
| Part | Brand says replace every | Changes a year | Source, date checked |
|---|---|---|---|
| OneFlow replacement media (OFRES-0935RM) | 3 years“Replacement Media ... OFRES-0935RM Media should be replaced every 3 years” | 1 every 3 years | brand sourcechecked 16 Oct 2026 |
Certification listings found
No IAPMO R&T listing matched this model when we searched on 16 Oct 2026.
Check it yourself
NSF’s and WQA’s terms don’t allow automated lookups, so these links open their public listings for this model:
- NSF listing search: OFRES-0935-K
- NSF listing search: OFRES-0935RM
- NSF listing search: A8210
- WQA listing search: OFRES-0935-K
- WQA listing search: OFRES-0935RM
- WQA listing search: A8210
- IAPMO R&T listing directory
What the brand says about certification
- “OneFlow media (A8210) is certified by WQA to NSF/ANSI/CAN Standard 61 and NSF/ANSI 372 for Lead Free compliance.” source checked 16 Oct 2026
- “The U-M311 is tested and certified by WQA to NSF/ANSI/CAN 61 for material safety and to NSF/ANSI 372 for Lead Free Compliance.” source checked 16 Oct 2026
- “They are scale prevention devices with proven third party laboratory test data and years of successful residential installations.” source checked 16 Oct 2026