Aquasana EQ-SS20 SimplySoft Salt-Free Water Conditioner
A genuinely low-maintenance salt-free water conditioner that tames scale buildup without stripping minerals or adding sodium — ideal for eco-conscious homeowners with moderately hard water, though it won't satisfy anyone expecting a traditional softener's slick-water feel. Overall Score: 8.2 / 10
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Overview
The Aquasana EQ-SS20 SimplySoft is a whole-house, salt-free water conditioner designed to address hard water problems without the drawbacks that come with conventional ion-exchange softeners. Instead of swapping calcium and magnesium ions for sodium, it uses a process called Template Assisted Crystallization (TAC) — a descaling technology that transforms dissolved hardness minerals into harmless microscopic crystals that pass through pipes and fixtures without adhering to surfaces.
This unit is squarely aimed at homeowners who are tired of lugging salt bags every month, dealing with slimy post-softener water, or navigating local salt-discharge bans. It is also a strong candidate for households with members on low-sodium diets, since no sodium is added to the treated water at any point. The system installs on the main water supply line and treats water for the entire home — from shower heads and faucets to dishwashers and water heaters — all without requiring electricity, drain connections, or a backwash cycle.
It is worth setting expectations clearly from the outset: the EQ-SS20 is a conditioner, not a softener. If you measure water hardness after treatment, the numbers will not change. What changes is the behavior of those minerals. Scale will stop building up over time, and existing scale in pipes may gradually dissolve, but your water will not feel as soft as it does from a salt-based system. Whether that trade-off works for you depends largely on what you want to solve — and that nuance is at the heart of this review.
Key Features
Converts dissolved hardness minerals into stable crystals that cannot adhere to pipe walls or heating elements, preventing and reversing scale buildup without removing minerals from the water.
Operates entirely without salt, potassium, or any chemical additives, making it compliant with discharge regulations in states like California where salt-based softeners are restricted.
Unlike ion-exchange softeners that flush brine during regeneration cycles, the EQ-SS20 produces no wastewater at all — an important distinction for both water conservation and municipal sewer load.
The system is entirely passive — water pressure drives flow through the TAC media. There are no timers, control valves, or power outlets needed, reducing both installation complexity and ongoing energy cost.
Rated for homes up to 4 bedrooms with flow rates sufficient for simultaneous showers, appliances, and outdoor fixtures without noticeable pressure drop in typical residential plumbing.
The TAC media inside the tank is rated to last approximately 6 years before replacement, dramatically lowering the cost of ownership compared to annual salt purchases or frequent filter swaps.
Full Specifications
| Feature | Value |
|---|---|
| Model Number | EQ-SS20 |
| Technology | Template Assisted Crystallization (TAC) |
| Treatment Type | Salt-free water conditioning (not softening) |
| Rated Capacity | Up to 4-bedroom homes |
| Flow Rate | Up to 7 gallons per minute (GPM) |
| Maximum Hardness | Up to 25 GPG (grains per gallon) |
| Inlet / Outlet Connection | 1-inch ports (adapters may be required for ¾-inch lines) |
| Operating Pressure | 20–80 PSI |
| Operating Temperature | 35–120°F (1.7–49°C) |
| Media Life | ~6 years |
| Salt Required | None |
| Electricity Required | None |
| Wastewater Produced | None |
| Tank Dimensions (approx.) | 9 in. diameter × 48 in. tall |
| Warranty | Limited lifetime on tanks; 1 year on parts and media |
| NSF Certification | NSF/ANSI 61 (drinking water system components) |
Pros & Cons
Pros
- No salt, bags, or ongoing consumables beyond media replacement every ~6 years
- Zero wastewater — genuinely eco-friendly operation
- No electricity needed, reducing running costs to essentially zero
- Retains beneficial minerals like calcium and magnesium in drinking water
- Proven TAC technology with solid scale-prevention track record
- Compliant with salt-discharge bans in California and other restricted areas
- Solid build quality with a lifetime tank warranty
- Straightforward inline installation — no bypass valves or drain lines required
Cons
- Does not produce the slick, "soft" feel associated with ion-exchange softeners
- Water hardness readings remain unchanged — may confuse first-time buyers
- Limited to 25 GPG — may underperform in extremely hard water areas
- Does not filter sediment, chlorine, or other contaminants on its own
- Professional installation recommended; adds to upfront cost
- Results take weeks to months to show on existing scale deposits
- No control head or display — no feedback on system status
Performance
In day-to-day use, the most noticeable improvement is where the EQ-SS20 is not — meaning the limescale that would normally crust around shower heads, glass doors, and faucet bases simply stops accumulating. After a few weeks of installation, homeowners consistently report that wipe-down cleaning becomes noticeably easier: mineral residue that once required descaling sprays will rinse away with plain water or a light wipe. This is TAC doing exactly what it promises — a result consistent with independent testing published by the Water Quality Research Foundation, which found TAC media effective at preventing scale formation across a range of hardness levels.
Water heater efficiency is another area where the benefits compound over time. Scale is one of the biggest silent killers of tank and tankless water heaters — even a thin layer of mineral buildup forces heating elements to work harder. The EQ-SS20's ability to prevent new scale formation and, over several months, encourage the gradual dissolution of existing deposits can meaningfully extend appliance life and maintain heating efficiency. Users with tankless heaters in very hard water areas tend to report the most dramatic improvements here.
Flow rate performance holds up well in everyday scenarios. The 7 GPM rating is sufficient for two simultaneous showers or a shower running alongside a dishwasher cycle without a pressure penalty. Only in larger homes with many simultaneous high-draw fixtures might you notice any restriction, and that's more a function of overall home plumbing design than the conditioner itself.
Important distinction: Because TAC changes the structure of minerals rather than removing them, a hardness test strip used after the EQ-SS20 will still show the same hardness number. This is expected and normal — it is not a sign the unit is malfunctioning. The "softness" benefit is behavioral, not chemical.
Where the EQ-SS20 draws the clearest line is in the shower experience. Those accustomed to the silky lather of a traditional salt softener will notice its absence. Soap and shampoo behave more or less as they would with untreated hard water — no dramatic lathering boost, no soft-water skin feel. Hair and skin care routines will not change the way they do with ion exchange. This is simply the reality of conditioner technology, and it is worth knowing before purchase.
Value for Money
The EQ-SS20's upfront cost sits in the mid-to-premium range for whole-house water treatment, typically landing between $700 and $1,000 depending on retailer and any bundled installation kits. That is a meaningful outlay, but when you factor in the near-zero ongoing costs — no salt ($15–$30 per bag, used monthly), no electricity, no brine water waste — the total cost of ownership over five to six years compares very favorably to a salt-based system of equivalent quality.
The value equation is strongest for homeowners who tick at least two of these boxes: they are on a municipal water supply with moderate to high hardness (roughly 7–25 GPG), they want to reduce appliance wear and scale-driven maintenance costs, they live in an area with salt-discharge restrictions, or they simply prefer a hands-off system they do not have to tend. For these buyers, the long-term math works clearly in the EQ-SS20's favor.
It is a harder sell for those in very hard water regions above 25 GPG, for renters who may not recoup the investment, or for households where the tactile "soft water feel" is non-negotiable. For the latter group, a traditional softener or a hybrid system (some manufacturers bundle TAC with pre-filtration and UV stages) may better meet expectations. It is also worth noting that if your water has significant iron, sediment, or chlorine concerns, the EQ-SS20 addresses none of those — you would need a separate filtration stage upstream.
Buyer tip: If your water has any chlorine, sediment, or iron concerns alongside hardness, consider pairing the EQ-SS20 with a dedicated pre-filter stage. Aquasana itself offers bundled whole-house systems that combine conditioning with carbon filtration for broader coverage.
Final Verdict
The Aquasana EQ-SS20 SimplySoft earns a strong 8.2 out of 10 as a specialist tool for a specific job: preventing and reducing limescale buildup across an entire home without salt, without electricity, and without waste. It does that job reliably and with minimal fuss over a multi-year service life. The TAC technology is well-established, the build quality is solid, and the environmental credentials are genuinely good — not just marketing language.
The caveats are real but clearly defined. It is not a replacement for a traditional softener if you want that characteristic soft-water feel. It does not filter contaminants. And it will disappoint anyone expecting their test strips to show a different hardness reading after installation. If you understand what a salt-free conditioner is — and is not — the EQ-SS20 is one of the best standalone options in its category. For the right household — one that wants reliable, low-maintenance scale prevention without the cost or upkeep of a salt system — it is an easy recommendation and a purchase you are unlikely to regret.
Does the Aquasana EQ-SS20 actually soften water?
No — and this is the most important distinction to understand before buying. The EQ-SS20 is a water conditioner, not a water softener. It does not remove hardness minerals from the water; instead, it uses Template Assisted Crystallization (TAC) to change the structure of those minerals so they cannot stick to surfaces. Your measured water hardness will remain the same, but scale buildup will be significantly reduced. If you want the classic slick, lathery feel of soft water, a traditional salt-based ion exchange softener is a better fit.
How hard does my water need to be to benefit from the EQ-SS20?
The EQ-SS20 is designed for water hardness up to 25 grains per gallon (GPG), which covers the vast majority of US municipal water supplies classified as hard or very hard. If your water tests above 25 GPG — a level found in some well water and certain southwestern regions — the system may underperform and a higher-capacity unit or traditional softener should be considered. You can get your water hardness tested for free through most municipal water utilities or with an inexpensive home test kit.
How often does the EQ-SS20 need maintenance?
The TAC media inside the tank is rated for approximately 6 years of normal residential use, after which it should be replaced to maintain effectiveness. Outside of that, the system requires essentially no routine maintenance — no salt refills, no filter changes, no backwash cycles, and no programming. It is one of the most hands-off whole-house water treatment systems available.
Can I install the EQ-SS20 myself, or do I need a plumber?
DIY installation is possible for homeowners comfortable with basic plumbing — the system uses standard 1-inch threaded connections and requires no electrical work or drain tie-in. However, most manufacturers and installation guides recommend professional installation to ensure correct pipe sizing, proper bypass valve placement, and that the unit is oriented correctly (flow direction matters). A professional install typically takes one to two hours and is often worth the peace of mind, especially given the unit's upfront cost.
Will the EQ-SS20 remove chlorine or other contaminants from my water?
No. The EQ-SS20 is designed exclusively to address hard water scale — it does not filter chlorine, chloramines, sediment, iron, heavy metals, or any other contaminants. If those are concerns for your household, you would need to add a separate filtration system, such as a whole-house carbon filter, either upstream or downstream of the conditioner. Aquasana offers combination systems that bundle conditioning with multi-stage filtration if you want a single integrated solution.