iSpring WGB21B 2-Stage Whole House Filter (10 in Sediment + CTO Carbon) review
Whole-house sediment and carbon filter. Plumber recommended if you are not comfortable with this install. Skill and code, not a preference. No third-party certification on record. Claims below are manufacturer-reported.
What it removes
| Contaminant | Evidence | Stated reduction | Scope |
|---|---|---|---|
| Chlorine (residual) | Manufacturer-reported | 99% |
Certified is an NSF, WQA, or IAPMO listing for that claim.
Particles and chlorine at the main. Does not soften.
Compact sediment/chlorine prefilter; install ahead of a softener or UV unit.
10 x 4.5 in Big Blue housings, 1 in NPT. Stage 1 5-micron PP sediment (FP15B), stage 2 5-micron CTO carbon block (FC15B). Manufacturer: up to 15 GPM, 50,000 gal or 12 months, up to 99% chlorine. Replacement set F2WGB21B $57.99 (manufacturer) -> annual est. $58. Manufacturer page shows SGS test imagery only; not in NSF database; no certification recorded. Does not reduce TDS.