Plumbing tool review
AFWFilters Fleck 5600 SXT Water Softener Review
Buy the AFWFilters 48K grain softener if you have hard water, a place to put a 54 inch tank near your main supply, and you want the Fleck 5600 SXT valve, which is the metered control head most independent plumbers still recommend because parts are available everywhere and it is repairable rather than disposable. Skip it if you have not tested your water hardness yet, because sizing a softener without a hardness number is guesswork and an oversized unit wastes salt while an undersized one runs out mid-shower.
AFWFilters 48K Grain Water Softener with Fleck 5600 SXT Valve
about $794
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| Spec | AFWFilters 48K Grain Water Softener with Fleck 5600 SXT Valve |
|---|---|
| Capacity | 48,000 grains |
| Control valve | Fleck 5600 SXT, digital metered |
| Resin | 1.5 cu ft, 10 percent crosslink |
| Mineral tank | 10 by 54 inches |
| Brine tank | 18 by 33 inches, holds up to 250 lb of salt |
| Connections | 1 inch NPT inlet and outlet, bypass and drain fittings included |
| Assembly | Assembled in the USA |
Specs come from the manufacturer's published product bullets returned by the Creators API. Price is approximate.
Sizing is arithmetic, not a guess
Softener sizing comes from three numbers: your water hardness in grains per gallon, the number of people in the house, and roughly 75 gallons of water per person per day. Multiply them and you get daily grain removal; a 48,000 grain unit should regenerate about once a week rather than daily. Get a hardness test first, either from your utility’s water quality report or a test kit, because everything else follows from it. If you are on a well, the hardness may also come with iron, which needs a different or additional treatment and will foul softener resin if ignored. Well owners can price the wider picture in the well drilling cost calculator.
Why the metered valve is the part you are buying
Timer-based softeners regenerate on a schedule whether the resin is exhausted or not, which wastes salt and water. The 5600 SXT meters actual water use and regenerates when the capacity is spent. Over years that difference is real money in salt and a meaningful reduction in the brine discharged to your drain or septic system. The Fleck valve is also the reason to prefer this over a sealed proprietary unit: parts and rebuild kits are widely available and a plumber will recognise it.
What softening actually protects
Scale is what hard water leaves behind, and it collects in the places that cost the most: water heater heat exchangers, dishwashers, washing machines and fixture cartridges. It matters most with a tankless water heater, where scale on the heat exchanger reduces flow and eventually ends the unit, which is why our Rinnai RX199iN review treats a softener as part of the tankless decision rather than an accessory to it. Our tankless vs tank water heater comparison covers the maintenance side of that choice.
Installation, and where a plumber earns their fee
The softener installs at the point of entry, after the main shutoff and usually before the water heater, with a bypass so the house keeps running while the unit is serviced. It needs a drain line for regeneration discharge with a proper air gap, and a nearby outlet. Soldering or press-fitting into the main is within reach of a competent DIYer, but a cross-connection or a missing air gap is a contamination issue rather than a leak, so if you are not confident, this is a plumber’s afternoon rather than a weekend. Price the wider plumbing picture in the water softener cost calculator, and if the pipework itself is old galvanised, read the whole house repipe cost calculator before you spend money on treatment for pipes you are about to replace.
The honest weakness: it is a salt system, and salt has consequences
Every ion exchange softener replaces hardness minerals with sodium, adds a small amount of sodium to your drinking water, and discharges brine to the drain. If you are on a septic system, or in one of the jurisdictions that restricts salt-based softener discharge, that matters and should be checked before purchase rather than after. The tank is also tall at 54 inches and the brine tank takes a real footprint, which surprises people planning to tuck it into a cupboard. And the unit is a kit rather than an appliance: it arrives as components to be assembled and programmed, and the documentation assumes more familiarity than a plug-in product would.
What owners consistently report
Published owner reviews of Fleck 5600 SXT based systems are consistently positive on the valve itself, which is the component with the longest track record in this category, and consistently mixed on packaging and instructions from resellers. Owners repeatedly note the difference in soap lathering and scale on fixtures within days, and repeatedly warn newcomers to program the hardness setting correctly, because a wrong hardness figure is the most common reason a new softener appears not to work.
Who it suits
- Homes on hard municipal water with three to five bathrooms
- Anyone installing or protecting a tankless water heater
- Owners who want a repairable valve with widely available parts
- Basements and garages with a drain and an outlet near the main
Who should skip it
- Homes that have not tested hardness yet
- Wells with significant iron, which needs treatment a softener alone will not provide
- Septic systems and jurisdictions that restrict brine discharge
- Spaces that cannot take a 54 inch tank plus a brine tank
Safety, stated plainly
Plumbing into the main supply creates a potential cross-connection, and the regeneration drain line must discharge through an air gap so that drain water can never be siphoned back into the potable supply. That is a public health requirement, not a preference. Anyone with a sodium-restricted diet should discuss softened water with their doctor, and many households keep one unsoftened tap for drinking and cooking. If your water quality problem includes bacteria, nitrates or lead, a softener does not address any of them: test properly and treat the actual problem.
Alternatives worth comparing
about $630
The same capacity with a digital metered head at a lower price, a reasonable choice when you want softened water without paying the premium for the Fleck valve’s parts availability.
View on Amazonabout $599
Packaged for a straightforward residential install with less assembly than a component kit, which suits anyone who would rather unbox one system than build one.
View on AmazonHow we researched this
We did not test the AFWFilters 48K Grain Water Softener with Fleck 5600 SXT Valve in person, and nothing here is written as though we did. This review is drawn from the manufacturer's published specifications, the product's own documentation, and the consensus of published owner reviews, which is summarised as exactly that rather than presented as our own use. Specifications are sourced as noted under the table above, and prices are approximate and move. Cost figures elsewhere on this site are 2026 estimates, not quotes. This is researched information, not professional advice: anything touching electrical, gas, structural, roofing or hazardous material work should go to a licensed professional and through your local permitting process. For the cost side of this decision, see Tankless vs Tank.
Frequently asked questions
What size water softener do I need?
Multiply your water hardness in grains per gallon by the number of people in the house and by about 75 gallons per person per day. That gives daily grain removal, and you want a unit that regenerates roughly weekly rather than daily. A 48,000 grain softener suits many three to five bathroom homes on moderately hard water, but test your hardness first because that number drives everything.
Is the Fleck 5600 SXT worth paying more for?
Its advantage is not performance, it is longevity and serviceability. The 5600 SXT is a long-established metered valve with widely available parts and rebuild kits, and most plumbers recognise it. A sealed proprietary head that fails out of warranty is usually replaced rather than repaired, which is where the extra cost comes back.
Can I install a water softener myself?
Many people do, and the mechanical work is within reach if you are comfortable joining pipe. The parts that need care are the bypass, which lets you service the unit without shutting off the house, and the drain line, which must discharge through an air gap so drain water can never be drawn back into the potable supply. If either of those is unfamiliar, hire a licensed plumber.
Does a water softener help a tankless water heater?
Substantially. Scale on a tankless heat exchanger reduces flow, triggers faults and shortens the unit’s life, and hard water is the leading cause. Manufacturers assume periodic descaling as routine maintenance; softening upstream reduces how fast that scale forms and is usually cheaper than a replacement heat exchanger.
How much salt does a water softener use?
It depends on hardness and water use, but a metered softener regenerating about once a week typically uses a bag of salt every few weeks in a family home. A timer-based unit regenerating on a fixed schedule uses noticeably more, which is the main running-cost argument for a metered valve.