iSpring Well Water Systems

What sets iSpring apart

Price and the absence of plumbing demands. Every iSpring unit here runs without a drain line, backwash or salt, and all but the UV need no power. The WSP-50 was $69.99, the WGB21B $173.99 (sale), the WGB22B $369.99, the WGB32B $516.99, the WGB32BM $535.99 and the UVF55FS $338.99 at ispringfilter.com as of Oct 2026. The WGB systems use standard 20 in. by 4.5 in. (or 10 in. for the WGB21B) cartridges, and every product has an in-stock Amazon listing for the exact model.

The warranty is the trade-off. iSpring's standard term is 1 year, activated on registration, with a 30-day money-back guarantee and lifetime technical support; paid 3-, 5- and 10-year extended warranties are sold alongside the whole-house and UV products. Certification is thin as well: the WGB32B and WGB32BM describe their sediment and carbon cartridges as third-party tested to meet NSF/ANSI standards without naming one, no certification is stated for the FM25B iron cartridge, the spin-downs cite none, and the UVF55FS has no NSF/ANSI 55 listing and no published dose.

Which iSpring for your water test

Sand or grit in the water: start with the WSP-50, a flushable 50-micron stainless screen in a clear housing with a 1 in. MNPT and 3/4 in. FNPT head rated about 20 GPM. Spend $10 more on the WSP-50SL if you also have mild scale and want Siliphos polyphosphate inhibition, replaced every 3-6 months; it is not a softener. Either one needs a 5-micron cartridge behind it.

Iron under 3 ppm and manganese under 1 ppm with no sulfur: the WGB32BM, whose FM25B cartridge is rated for 50,000 gallons at 3 ppm iron and works across pH 6-11. On a heavier iron well the cartridge changes add up fast, and a backwashing unit such as the SpringWell WS1 or the Matrixx inFusion is the better long-term buy. The base WGB32BM makes no hydrogen sulfide claim.

A clean test with sediment, taste or odor complaints: the WGB22B (100,000 gallons per set, 15 GPM) for most homes, the WGB21B (50,000 gallons) for a small home or cabin, or the WGB32B for a second carbon block. A bacteria result on filtered, clear water: the UVF55FS at 12 GPM with a flow-sensing ballast, accepting that it carries no certification where the Pentair Premium UV is NSF/ANSI 55 Class A.

Warranty

Standard 1-year limited manufacturer warranty on systems (activated on registration), 30-day money-back guarantee and lifetime technical support; paid 3-, 5- and 10-year extended warranties are sold alongside whole-house and UV products.