About iSpring
iSpring designs and supports its water filtration systems from Cumming, Georgia, in the greater Atlanta metro area, where the company says it has been based for nearly two decades. The lineup covers both ends of a home's water needs: under-sink and countertop reverse osmosis systems for drinking water, and whole-house point-of-entry systems that treat every tap in the house, along with shower filters, faucet-mount filters, and the replacement cartridges that keep all of it running.
Every iSpring reverse osmosis system carries NSF/ANSI 58 certification, the independent lab standard that verifies a system's contaminant-reduction claims rather than taking the manufacturer's word for it. The brand also holds a 4.9-out-of-5 "Excellent" rating on Trustpilot and backs purchases with lifetime US-based technical support out of its Atlanta office. In our own testing, that certification stack shows up in the hardware: housings and fittings that hold up under sustained household water pressure instead of degrading after a season.
Brand website: ispringfilter.com
What iSpring makes
iSpring's range runs wider than the products we review. The lines we know best from our own testing are marked with a star:
Reverse osmosis systems
under-sink and tankless, NSF/ANSI 58 certified — featured on DIYRated
Whole-house point-of-entry systems
sediment, carbon, and iron/manganese-reducing stages for city or well water — featured on DIYRated
Under-sink and countertop filters
non-RO carbon filtration for renters and simpler installs
Shower filters
inline chlorine and sediment reduction at the shower arm
Faucet-mount filters
tool-free attachment to an existing kitchen faucet
Replacement cartridges and maintenance parts
stage-specific filters for every iSpring system
Why we recognized iSpring
The DIYRated Top Brand recognition isn't paid for and can't be applied for. We award it to the brands whose products consistently stand out in our hands-on category reviews. iSpring earned it on the strength of the products below, evaluated the same way every product on this site is: bought, put to work on real jobs, and judged on merit.
iSpring products we rated highly
iSpring RCC7AK 6-Stage Reverse Osmosis Drinking Water Filter System with Alkaline Remineralization
This six-stage under-sink RO system carries NSF/ANSI 58 certification plus a WQA gold seal, the strongest third-party certification stack we found in its price tier. It removes up to 99 percent of TDS, including fluoride, lead, arsenic, chlorine, PFAS, and chromium-6, and its final alkaline remineralization stage adds calcium, magnesium, and potassium back into the water so it doesn't taste flat the way plain RO permeate can. The box ships with the dedicated faucet, storage tank, and all tubing needed for a full install, and it has built up more than 21,000 verified reviews at 4.6 stars, the deepest track record of any under-sink RO system we tested.
Read the 7 Best Water Filters of 2026 guide →
iSpring WGB32BM 3-Stage Whole House Water Filter with Iron and Manganese Reducing Filter
Built for well water, this whole-house system adds a catalytic carbon stage on top of sediment and standard carbon filtration to handle the iron and manganese that stain fixtures and laundry. Its 1-inch NPT ports flow 15 gallons per minute, enough headroom for a house with multiple bathrooms and a laundry room running at once, and the Big-Blue 4.5-by-20-inch housings hold four to five times the filter media of standard 10-inch housings. Rated for 100,000 gallons, roughly a year of use for a family of four, before the cartridges need swapping.
Read the 7 Best Water Filters of 2026 guide →
iSpring WCB32O 3-Stage Whole House Water Filter for Chlorine and Sediment
A straightforward three-stage whole-house system for city water, sized to handle the chlorine and sediment that drive most municipal-water complaints. The 10-inch housings use standard cartridges available from any home center, so there's no proprietary filter lock-in, and the 3/4-inch NPT ports match standard residential supply lines without needing bushings or adapters in most homes built after 1990. Rated for 100,000 gallons, about a year of typical household use, before the cartridges need replacing.
Read the 7 Best Water Filters of 2026 guide →What earned iSpring the recognition
- Every iSpring reverse osmosis system carries NSF/ANSI 58 certification, the independent lab standard that verifies contaminant-reduction claims rather than relying on manufacturer marketing.
- One of the deepest review track records in the under-sink RO category on Amazon: the RCC7AK alone has more than 21,000 verified reviews at 4.6 stars.
- Product line covers both under-sink drinking-water systems and whole-house point-of-entry systems, so city-water and well-water households can each get a system built for their actual water, not a one-size-fits-all unit.
- Whole-house systems use standard housing sizes with widely available replacement cartridges rather than a proprietary format that locks buyers into one supplier.
- Backed by a 4.9-out-of-5 "Excellent" rating on Trustpilot and lifetime US-based technical support from the company's Atlanta-area office.