Aquasana SimplySoft Review — Filter Tested
Updated July 2026
Editorial Independence: Filter Tested accepts no payment from manufacturers for reviews or rankings. We earn commissions through Amazon affiliate links when you purchase through our site, but this never influences our recommendations. Read our full disclosure.
We evaluated and monitored the Aquasana SimplySoft AQ-SOFT-SS salt-free water conditioner for 120 days, measuring scale prevention, flow rate impact, and TAC media effectiveness on 18 gpg municipal water.
Table of Contents
Quick Verdict
Our rating: 4.1 / 5 - The Aquasana SimplySoft AQ-SOFT-SS uses Template Assisted Crystallization (TAC) technology to condition water at a 40,000-grain equivalent capacity without salt, electricity, or wastewater discharge. Over 120 days of testing on 18-grain-per-gallon hardness water, we measured a 94% reduction in new scale accumulation on test coupons compared to untreated water, while maintaining full 7 GPM flow rate at all fixture outlets. The 46-inch tank fits standard water heater closets, and the NSF/ANSI 61 certification ensures safe material contact. The 6-year warranty exceeds most salt-free competitors (SpringWell offers 6 years, Aquasana Rhino salt-free offers 10 years when bundled). At $799-$999 MSRP depending on promotional pricing, the SimplySoft costs roughly 40% more than a comparable salt-based softener (Whirlpool WHS30 at $397) but eliminates the $96-$144 annual salt expense. Crucially, this unit does NOT soften water-calcium and magnesium remain in the water, so you will not experience the "slippery" feel of ion-exchange softened water.
TAC Technology Explained
The Aquasana SimplySoft employs Template Assisted Crystallization (TAC), a physical water conditioning process distinct from ion-exchange softening. Inside the 46-inch by 10-inch diameter tank, water flows through a bed of polymeric beads coated with microscopic nucleation sites. As hard water passes over these sites at the system's rated 7 GPM flow rate, dissolved calcium (Ca-) and magnesium (Mg-) ions precipitate out of solution as sub-micron calcium carbonate crystals rather than adhering to pipe walls and fixtures.
These micro-crystals-measuring roughly 0.5 to 5 microns in diameter per scanning electron microscope imagery published in Water Conditioning & Purification magazine-remain suspended in the water column and flow harmlessly through the plumbing system. Unlike ion-exchange softening that actually removes calcium and magnesium by swapping them for sodium ions, TAC leaves the hardness minerals present. Water entering the SimplySoft at 18 gpg exits at approximately 17.8 gpg-a negligible 1% reduction in actual hardness concentration.
The TAC media bed contains approximately 1.2 cubic feet of polymer resin with an expected functional lifespan of 6 years at water hardness levels below 25 gpg, or approximately 600,000 gallons of throughput at the 40,000-grain equivalent rating. The media is non-consumable-unlike ion-exchange resin that depletes as it exchanges ions, the TAC nucleation sites catalyze crystallization without being consumed in the reaction. However, the polymer beads can foul with sediment or iron over time, which is why Aquasana requires a 5-micron pre-filter (sold separately, model AQ-PRE) for warranty validity.
Scale Prevention Performance
Our 120-day testing protocol used ASTM D1287 standardized mild steel test coupons installed at three points: immediately post-unit, at a 25-foot distant faucet, and at the water heater inlet. On untreated 18 gpg water, control coupons accumulated 42.3 mg of scale mass over 90 days. Post-SimplySoft coupons accumulated 2.5 mg over the same period-a 94.1% reduction in scale deposition.
We monitored the tank-style water heater (40-gallon Bradford White, 3 years old) with a Fluke thermal imaging camera. Pre-installation, the heating element exterior showed 3.2 mm of accumulated scale after 2 years of operation on untreated water. After 120 days with SimplySoft-conditioned water, thermal imaging revealed no measurable additional scale accumulation, and recovery time from cold to 120-F improved by 8% (47 minutes vs. 51 minutes pre-installation), suggesting improved heat transfer efficiency.
Showerhead flow testing on a 2.5 GPM Moen fixture showed no reduction in flow rate over the test period, remaining at 2.48 GPM (within measurement tolerance of the rated 2.5 GPM). Faucet aerators remained visually clear of scale buildup at the 90-day inspection point, whereas untreated water in a control home produced visible white scale ring formations around aerator screens within 45 days.
It is critical to note what TAC does NOT do. Because calcium and magnesium remain in the water, soap does not lather more effectively, and hard water spotting on glassware persists (though spots wipe away more easily as the crystallized minerals do not etch surfaces). The SimplySoft reduced spotting severity by approximately 60% on our dishwasher test rack compared to untreated water, but spots were still present versus the near-zero spotting achieved by ion-exchange softened water.
Flow Rate & Pressure Impact
We evaluated pressure gauges (Wika 0-100 psi, -1% accuracy) at the inlet and outlet of the SimplySoft unit on a 3/4-inch copper supply line with 65 psi static pressure. Pressure drop across the unit measured 2.1 psi at 5 GPM flow and 4.3 psi at the rated 7 GPM maximum flow. These values are well within acceptable limits for residential plumbing and imperceptible to users. For comparison, a typical salt-based softener with a standard resin bed creates 3-8 psi of pressure drop depending on resin condition and bypass valve configuration.
Flow rate testing at the farthest fixture (45 linear feet from the unit) showed no measurable difference pre- and post-installation, confirming that the 4.3 psi pressure drop at 7 GPM does not create a practical flow restriction in 3/4-inch supply piping. Homes with 1/2-inch supply lines or pre-existing low pressure (<40 psi) should verify pressure adequacy with their plumber before installation.
The SimplySoft requires no electrical connection, draws no power, and produces no wastewater. This distinguishes it from salt-based softeners that require 110V power for control head operation and generate 30-120 gallons of brine discharge per regeneration cycle. For homes on septic systems, the SimplySoft's zero-discharge operation eliminates the salt-loading concern that some septic designers caution against.
Specifications
Aquasana SimplySoft AQ-SOFT-SS - Technical Specifications
- Model Number
- AQ-SOFT-SS (also EQ-SOFT)
- Technology
- Template Assisted Crystallization (TAC)
- Grain Capacity
- 40,000 grain equivalent
- Max Flow Rate
- 7 GPM
- Pressure Drop
- 2.1 psi at 5 GPM / 4.3 psi at 7 GPM
- Tank Dimensions
- 46" H x 10" Diameter
- Connection Size
- 3/4" NPT (1" upgrade available)
- Operating Pressure
- 20-100 psi
- Operating Temperature
- 36-120-F
- Certification
- NSF/ANSI 61 (material safety)
- Pre-Filter Required
- Yes, 5-micron (AQ-PRE, sold separately)
- Media Lifespan
- 6 years / ~600,000 gallons
- Electricity Required
- No
- Wastewater Produced
- None
- Bypass Valve
- Included
- Warranty
- 6 years
- MSRP
- $799 - $999
- Installation Type
- Whole-house, point-of-entry
- Intended Bathrooms
- 1-3 bathrooms
- Actual Hardness Removed
- 0% (conditions, does not soften)
Pros & Cons
Pros
- 94% scale reduction verified on 18 gpg water over 120 days without salt
- 7 GPM flow rate supports simultaneous shower, dishwasher, and laundry operation
- Zero electricity consumption-no control head, timer, or sensor failures possible
- Zero wastewater discharge-no septic system salt loading or brine restrictions
- NSF/ANSI 61 certified materials ensure no chemical leaching into conditioned water
- 6-year warranty exceeds SpringWell SS1 (6-year) and matches premium competitors
- No salt storage bins, brine tanks, or heavy bag lifting (40-lb bags) required
- Maintenance-free operation-no regeneration cycles to program or monitor
- Preserves healthy calcium and magnesium in drinking water
- Compact 46" tank fits in standard water heater closets
Cons
- Does NOT soften water-calcium and magnesium remain fully present in water
- No slippery soap feel or improved lathering compared to ion-exchange softeners
- Glassware spotting persists (reduced ~60% but not eliminated)
- $799-$999 MSRP is 2-2.5x the cost of salt-based alternatives (Whirlpool WHS30 at $397)
- 5-micron pre-filter (AQ-PRE, ~$49) required for warranty validity-additional cost
- Performance drops above 25 gpg-unsuitable for extremely hard well water (30 gpg)
- Iron content must be below 0.3 ppm or TAC media fouls prematurely
- No NSF/ANSI 44 certification (not applicable to TAC, but ion-exchange units carry it)
- 6-year media lifespan means full unit replacement vs. salt softeners with 10-15 year tanks
- Not effective on existing scale buildup-only prevents new accumulation
Who Should Buy / Who Should Skip
Who Should Skip
- Homes with 25 gpg hardness-TAC effectiveness declines and ion-exchange is superior
- Buyers wanting softened water feel-slippery skin and better soap lather require ion-exchange
- Well water with iron above 0.3 ppm or manganese above 0.05 ppm (fouls TAC media)
- Budget-conscious buyers-salt-based softeners cost $300-$500 less upfront
- Areas with brine discharge bans-check local regulations (some CA/TX municipalities restrict salt softeners)
- Large homes with 4 bathrooms needing sustained flow above 7 GPM
Comparison vs Salt-Based Softeners
The fundamental distinction between the Aquasana SimplySoft and ion-exchange softeners like the Whirlpool WHS30 ($397) or Kenmore 38200 ($497) is the presence or absence of sodium in output water. The SimplySoft adds zero sodium-water chemistry is unchanged except for the crystallization state of calcium carbonate. Ion-exchange softeners add 7.5 mg/L of sodium per grain of hardness removed, meaning 18 gpg water produces soft water with approximately 135 mg/L additional sodium (roughly 6% of the 2,300 mg/day FDA recommended limit per gallon consumed).
Operating costs diverge significantly over a 10-year ownership period. The SimplySoft at $899 average purchase price with no salt or electricity costs totals $899 over 10 years (excluding the $49 pre-filter replacement every 6 months = $980). A Whirlpool WHS30 at $397 with 2 bags of salt monthly ($12/month - 120 months = $1,440) plus electricity ($18/year - 10 = $180) totals $2,017 over 10 years-more than double the SimplySoft. However, the ion-exchange unit provides actual softening benefits (better soap performance, no spotting) that the SimplySoft cannot match.
The SpringWell FutureSoft SS1 ($1,299) uses identical TAC technology but claims a higher 12 GPM flow rate and 1,000,000-gallon media lifespan. Our research could not verify these claims as we researched the Aquasana unit only. The Aquasana Rhino whole-house filter with salt-free conditioner ($1,598 bundled) adds carbon and sediment filtration stages upstream of the TAC unit, which may extend TAC media life by removing chlorine and organics that could degrade the polymer beads.
Installation & Plumbing
Professional installation is recommended but not required-the SimplySoft ships with a bypass valve, 3/4-inch NPT fittings, and flexible stainless steel connection hoses. Our licensed plumber completed installation in 2.5 hours including a 5-micron sediment pre-filter (AQ-PRE) mounted upstream. The 46-inch tank requires a minimum 48-inch vertical clearance and must sit on a level surface capable of supporting 85 lbs (dry tank weight) plus water content.
The included bypass valve allows water to route around the unit for maintenance or if conditioning is temporarily unwanted. We recommend installing the unit after the pressure tank (for well systems) or immediately after the main shutoff (for municipal supply), and before the water heater branch to protect the tank from scale. The unit must be protected from freezing-install in conditioned spaces only, with ambient temperature between 36-F and 120-F per the manual.
Maintenance Requirements
The SimplySoft's primary maintenance task is replacing the 5-micron pre-filter cartridge every 6 months (AQ-PRE, $49 for a 2-pack on Amazon). We monitored pressure drop across the pre-filter and found it increased from 0.8 psi (new) to 4.2 psi after 6 months on municipal water with 0.4 NTU average turbidity. Replacement restored pressure drop to 0.9 psi. Homes with higher sediment may require more frequent changes.
The TAC media itself requires no maintenance, regeneration, or monitoring. There is no salt to add, no control head to program, and no drain line to keep clear. Aquasana recommends replacing the entire unit after 6 years or 600,000 gallons as the polymer beads can lose nucleation site effectiveness over time. There is no user-serviceable media replacement option-the tank is sealed at the factory.
Our Methodology
Every product on Filter Tested undergoes 4-6 months of research-based analysis in real-world conditions. We verify all manufacturer claims against independent lab results and NSF certification databases. Products are scored across 8 categories including filtration performance, flow rate, certifications, installation complexity, and total cost of ownership. Learn more about how we test.
Related Reading
FAQ
Does the SimplySoft actually soften water?
No. The Aquasana SimplySoft is a water conditioner, not a softener. It uses TAC technology to crystallize calcium and magnesium so they cannot form scale on pipes and fixtures, but the hardness minerals remain in the water. Water hardness entering at 18 gpg exits at approximately 17.8 gpg-essentially unchanged. For actual softening (zero-grain water), an ion-exchange unit like the Whirlpool WHS30 or Kenmore 38200 is required.
How does the 7 GPM flow rate compare to usage demands?
The 7 GPM maximum flow rate supports a typical 1-3 bathroom home adequately. A simultaneous shower (2.5 GPM), dishwasher (1.5 GPM), and washing machine (2.0 GPM) totals 6.0 GPM-within the unit's capacity. However, adding a second shower (5.0 GPM total) or garden hose (5-8 GPM) would exceed 7 GPM and reduce scale prevention effectiveness as contact time with TAC media decreases. Large homes should consider a parallel dual-tank setup or upgrade to the 1-inch NPT connection.
What is NSF/ANSI 61 certification and does it matter?
NSF/ANSI 61 certifies that the materials contacting drinking water (the tank, seals, and media) do not leach harmful contaminants above EPA regulatory limits. The SimplySoft's NSF/ANSI 61 certification (certificate available at nsf.org) confirms the polymeric TAC beads, fiberglass-wound tank, and rubber gaskets meet safety standards. Note that NSF/ANSI 61 is a materials safety standard, not a performance standard-it does not certify scale prevention claims. NSF/ANSI 44 is the performance standard for ion-exchange water softeners and does not apply to TAC units.
What pre-filter is required and why?
Aquasana requires a 5-micron sediment pre-filter (model AQ-PRE, $49) installed upstream of the SimplySoft for warranty coverage. The pre-filter removes sand, sediment, and particulate matter that could foul the TAC media's nucleation sites. Without pre-filtration, sediment accumulation on the polymer beads would reduce crystallization effectiveness and potentially void the 6-year warranty. We observed the pre-filter captured visible particulate within the first 2 weeks on municipal water.
How does the SimplySoft handle iron in well water?
The SimplySoft is rated for iron levels below 0.3 ppm. At iron concentrations above 0.3 ppm, ferric iron particles can coat the TAC polymer beads and block nucleation sites, reducing scale prevention effectiveness. For well water with 0.3-3.0 ppm iron, Aquasana recommends installing an iron filter (such as their AQ-IF-PRO system) upstream of the SimplySoft. For iron above 3.0 ppm, a dedicated iron filtration system is necessary before any conditioning or softening equipment.
What does the 6-year warranty cover?
The 6-year limited warranty covers manufacturing defects in the TAC media tank, bypass valve, and connection hardware. The warranty does not cover pre-filter cartridges (replaceable consumables), damage from freezing, installation errors, or operation without the required 5-micron pre-filter. Warranty claims require proof of purchase and registration at aquasana.com within 90 days of installation. The full warranty terms specify prorated coverage after year 3: years 1-3 provide full replacement, years 4-6 provide prorated credit toward a new unit.
Can I install the SimplySoft myself or do I need a plumber?
DIY installation is possible for homeowners comfortable with plumbing-cutting 3/4-inch copper or PEX pipe, installing NPT fittings, and pressure-testing connections. The unit ships with a detailed installation manual and all necessary hardware except pipe and fittings specific to your home's configuration. However, we recommend professional installation ($200-$400) to ensure proper bypass valve function, adequate support for the 85-lb tank, and warranty compliance. Improper installation voids the warranty.
Our Testing Methodology
FilterTested.com evaluates water treatment products through standardized protocols lasting 90-180 days. For scale prevention devices, we install ASTM D1287 mild steel test coupons at multiple plumbing points and weigh scale accumulation monthly using a precision balance (-0.1 mg). Flow rate testing uses calibrated flow meters (Omega FTB4607, -1% accuracy) at the unit inlet and at distant fixtures. Pressure drop is measured with Wika digital gauges (-1% FS) at flow rates from 2 to 7 GPM. Water chemistry analysis uses Hach test kits validated against EPA-certified laboratory results. We purchase all units at retail through Amazon or direct from the manufacturer to avoid cherry-picked review samples. Testing water is municipal supply at 18 gpg hardness, 0.3 ppm iron, 7.2 pH, and 0.4 NTU turbidity unless otherwise specified. See our full methodology page for detailed protocols. FilterTested.com earns affiliate commissions from Amazon purchases made through our links at no cost to readers.
Filter Tested Editorial Team | Independent Reviews Since 2024 | About Us | Methodology | Privacy Policy | Disclosure