iSpring WGB32BM 3-Stage Whole House Iron & Manganese Filter

Name: iSpring WGB32BM 3-Stage Whole House Iron & Manganese Filter
Brand: iSpring
Price: 535.99 USD

Iron filter · 15 GPM · Treats iron, manganese, sediment · $536 at iSpring as of Oct 2026

The iSpring WGB32BM is the well-water version of iSpring's three-stage Big Blue system. Stage one is a 5-micron sediment cartridge, stage two a coconut-shell carbon block, and stage three the FM25B iron and manganese cartridge, rated for iron up to 3.0 ppm and manganese up to 1.0 ppm. It also handles rust, taste, odor and chlorine (up to 99%, maker claim). The base model makes no hydrogen sulfide claim; the WGB32B-MKS variant adds one.

Peak flow is 15 GPM through 1 in. NPT ports at 25-80 psi, 40-100 F and pH 6-11. The FM25B is rated for 50,000 gallons at 3.0 ppm iron; the sediment and carbon cartridges last 100,000 gallons or up to 12 months. There is no drain, power, salt or backwash. The unit is 24.5 by 8 by 28 in. and 55 lb. Stages one and two are described as third-party tested to NSF/ANSI standards; none is stated for the iron cartridge or system.

Price was $535.99 at ispringfilter.com as of Oct 2026 (regular price). Warranty is 1 year with lifetime free tech support and paid 3-, 5- and 10-year extensions. Install is DIY with a manual and video.

Check price at iSpring See it at Amazon

iSpring WGB32BM 3-Stage Whole House Iron & Manganese Filter well water iron filter

Specifications

Verified 2026-10-06. Fields the manufacturer does not publish are marked “Not stated”.

iSpring WGB32BM 3-Stage Whole House Iron & Manganese Filter specifications
Model	WGB32BM (FP25B sediment + FC25B carbon block + FM25B iron/manganese cartridge). Also sold as WGB32BMF3 with an extra filter set ($649.99) and WGB32BM+AHPF12MNPT16X2 with hose connectors ($653.99).
Type	Iron filter
Treats	Iron, Manganese, Sediment; also chlorine (up to 99%, maker claim), taste and odor, rust
Service flow	15 GPM'Peak flow 15 GPM'. Working pressure 25-80 psi; 40-100 F; pH 6-11. Iron reduction rated for 'MAX 3.0 ppm' and manganese 'MAX 1.0 ppm' (listed as down to 0.01 ppm on the Amazon listing).
Capacity	50,000 gallonsFM25B iron/manganese cartridge: 50,000 gallons at 3.0 ppm iron. Sediment and carbon cartridges: 100,000 gallons / up to 12 months.
Media / technology	5-micron PP sediment + coconut-shell carbon block + FM25B iron/manganese reduction cartridge (20 in. x 4.5 in.)
Stages	3
Connection	1 in. NPT
Installation	DIY'DIY-Friendly Installation' with manual and video; 1 in. NPT ports; no drain, power or backwash.
Warranty	1-year manufacturer warranty'1-year manufacturer warranty' and 'life-time free tech support' per product page; paid 3/5/10-year extended warranties offered.
Certifications	Not statedProduct page: the stage 1 and 2 filters 'are tested by an independent third-party to meet NSF/ANSI standards'; no standard number or certifier is named, and nothing is stated for the FM25B iron/manganese cartridge or the system as a whole. The bracket label visible in iSpring's own product photo reads 'TESTED AND CERTIFIED Against NSF/ANSI Standards 42, 5_' (second number illegible at the published resolution); this is not repeated in the page text or the manual and is not recorded as a certification. iSpring's 'NSF Certified Collections' page lists no WGB model. WQA certified-product search (find.wqa.org) returned zero results for 'iSpring', 'iSpring Water', '123Filter', 'WGB32B' and 'RCC7AK' on 2026-10-06 (a control search for 'Culligan' returned listings). Weight published as 55 lb on the base listing. NSF certified-product database (info.nsf.org), searched 2026-10-06: iSpring Water Systems LLC (Cumming, GA) is listed only under NSF/ANSI 58 (RO systems) and NSF/ANSI/CAN 372 (WSP ...ARJ spin-down variants). WGB32BM does not appear.
Dimensions	24.5 x 8 x 28 in.
Weight	55 lb
Price	$536 at iSpring as of Oct 2026

Published features

3-stage 20 in. x 4.5 in. cartridge system 'specially designed for well water users'
FM25B cartridge reduces iron up to 3.0 ppm and manganese up to 1.0 ppm
5-micron sediment and coconut carbon block stages
Up to 15 GPM, 1 in. NPT
No drain, power, salt or wastewater
DIY install with manual and video

Pros and cons

Pros

Cartridge-based iron/manganese reduction with no drain, power or backwash
Much lower entry price than tank-style air-injection filters
In-stock Amazon listing for the exact model

Cons

Iron limit of 3 ppm and 50,000-gallon cartridge life mean frequent, costly cartridge changes on iron-heavy wells
No hydrogen sulfide claim on the base model (the WGB32B-MKS variant adds it)
1-year warranty; no third-party certification for the iron cartridge

Our take

For a well with iron under 3 ppm and manganese under 1 ppm, the WGB32BM is the lowest-cost way to get iron reduction with no drain, power or backwash. The trade-off is the 50,000-gallon iron cartridge: on a heavier iron well you will change it often and the cost adds up. If your test shows more iron or any sulfur, a tank-style unit like the SpringWell WS1 is the better long-term buy.

Not sure it is the right size for your flow and your water test? Work through the sizing guide, or compare every system we cover on the best well water filtration systems (2026) list.

Where to buy

$536 at iSpring as of Oct 2026. Prices change; the links open the current listing.