The Aquasana Rhino and the iSpring WGB32B are the two most compared whole house systems in different price brackets. The Rhino is a $999 to $1,998 dual tank system built to run a decade. The WGB32B is a roughly $517 cartridge system built to be affordable and DIY friendly. This is a classic pay now or pay over time decision, and the math is refreshingly clear.

For the full category picture, see our best whole house water filter comparison.

Head to head specs

Spec iSpring WGB32B Aquasana Rhino EQ-1000
Price About $517 About $999 on sale, $1,998 at full price
Filtration stages 3 cartridge stages, sediment plus carbon and KDF Upflow dual tank, sediment pre filter plus carbon and KDF tanks
Certifications Cartridges tested by third party to NSF/ANSI standards, not certified NSF/ANSI 42 certified for 97 percent chlorine reduction, WQA certified to NSF/ANSI/CAN 61
Flow rate 15 GPM 7 GPM rated
Filter life 100,000 gallons, about 1 year 1,000,000 gallons or 10 years
Replacement cost About $126 per year for the 3 pack About $120 per year, pre filter every 2 to 3 months
Warranty 1 year limited, lifetime tech support 10 year limited
Money back guarantee 30 days 90 days
Installation DIY friendly Licensed plumber recommended

The iSpring price of $516.99 comes from a September 2026 price check. The Aquasana price moves with near constant promotions, $999 on sale per its own live product data, $1,998 at full price. Verify both on the day you buy.

Filtration approach

The iSpring WGB32B is a three stage cartridge system. Stage one is a 5 micron polypropylene sediment filter. Stage two is a compound KDF and carbon filter targeting chlorine, chloramine, lead, mercury, hydrogen sulfide, and heavy metals. Stage three is a carbon block for taste, odor, and chemicals. The cartridges sit in standard 20 inch by 4.5 inch housings with 1 inch connections. iSpring says the carbon block filters are tested by an independent third party to meet NSF/ANSI standards. Note the wording. Tested to meet standards is not the same as certified, and no certifier lists the WGB32B.

The Aquasana Rhino is a dual tank system. Water flows upward through an activated carbon tank and a copper zinc KDF tank, a design Aquasana says increases contact time and prevents channeling. The Rhino is independently tested to NSF/ANSI Standard 42 to remove 97 percent of chlorine across the full 1,000,000 gallon media life. That is a certified claim with a named standard, which is a higher bar than the iSpring's tested language.

Our take: Aquasana's filtration story is stronger on paper and in certification. The iSpring covers the common municipal contaminants well, but its claims rest on manufacturer testing.

Price and value

This is the iSpring's home turf. At about $517 it costs roughly half the Rhino's sale price and roughly a quarter of its full price. For a buyer whose main problem is chlorine taste and odor in city water, the WGB32B solves it for the price of a nice faucet.

But run the 10 year math before celebrating. The iSpring needs a $126 filter pack every year, about $1,260 over a decade, bringing its 10 year total to roughly $1,777. The Aquasana at the $999 sale price needs about $120 a year in pre filters, about $1,200 over a decade, for a 10 year total around $2,199. At full price the Rhino's 10 year total lands near $3,200. So the iSpring is cheaper over a decade in every scenario, by roughly $400 against the sale price Rhino and by much more against full price.

The catch is what that money buys. The Aquasana's decade includes a 10 year warranty, certified filtration, and two filter changes a year of a $10 pre filter versus the iSpring's full cartridge swap. Cheaper is not the same as better value.

Our take: iSpring wins on pure cost. Whether it wins on value depends on how much you prize certification and warranty.

Maintenance

Both systems demand about $120 a year in upkeep, which surprises buyers who assume the cheaper system is cheaper to run. The difference is the shape of the chore. The iSpring wants a full cartridge swap once a year, three big housings opened, cartridges replaced, housings reseated. It is a 30 minute annual project. The Aquasana wants a small pre filter swapped every 2 to 3 months, a 5 minute job you will do four to six times a year.

The iSpring's transparent housing is a nice touch, you can see sediment building up and know exactly when a change is due. The Aquasana's frequent schedule is harder to forget but easier to resent.

Our take: roughly a tie on cost, pick your chore. One big annual project or several tiny ones.

Installation

The iSpring is built for DIY. Standard connections, a clear manual, and video walkthroughs from the company's Atlanta based support team. A handy homeowner can have it running in an afternoon.

Aquasana strongly recommends a licensed plumber for the Rhino, and its warranty language backs that up. Professional installation typically adds a few hundred dollars. That is real money on top of an already premium price, and it is worth budgeting before you compare stickers.

Our take: iSpring, easily. No contest for DIYers.

Well water vs city water

Both of these are city water systems at heart. For chlorinated municipal water with sediment and taste issues, either works, and the decision comes down to budget versus longevity.

For well water, look past both flagships. iSpring sells the WGB32B-MKS variant at about $609 with a dedicated iron and manganese stage rated for iron up to 3.0 ppm, which is a genuinely useful well water option at a low price. Aquasana's well answer is the Rhino Well Water with UV line. Neither standard model here is the right pick for a problem well. Get a water test first, then shop each brand's well specific systems.

Our take: for typical wells with iron, the iSpring MKS variant is an affordable targeted option. For complex well chemistry, shop the dedicated well lines.

Verdict by buyer type

Buy the iSpring WGB32B if your budget is tight, you are comfortable with DIY plumbing, your main issues are chlorine taste and sediment, and you do not mind a yearly cartridge swap. It is the lowest cost path to filtered water in every room, and its 15 GPM flow embarrasses systems costing three times more.

Buy the Aquasana Rhino if you want a decade of nearly hands off filtration, independent certification matters to you, you prefer professional installation, or you want the option to add UV sterilization and salt free conditioning from the same brand later. It costs more in every scenario, but it is the more proven long term system.

For a second opinion at the category level, read our best whole house water filter guide, our Aquasana review, and our iSpring review.

A note on how we compare: FilterFluent has not lab tested these systems. This comparison is built from manufacturer spec sheets, certification listings, and independent benchmarks, and every number above traces to a named source. We link directly to the manufacturers. We are currently applying to their affiliate programs, and those links will be labeled if that changes.