Report: Fleck models we rankLast updated:

Fleck Water Softeners

Fleck is a control-valve maker (part of Pentair), not a softener brand. Dealers and online sellers like AFWFilters and DuraWater build complete systems around Fleck 5600SXT and 9100SXT valves, which is why parts and service are easy to find. Below are the 5 Fleck models in our rankings, best placed first; compare them with every other brand on the best water softener brand page.

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Fleck models we rank, best placed first

  1. 1
    Original illustration based on the AFWFilters Fleck 5600SXT 48K's shape and colour — not a product photo

    Why it's here: #2 in hub. The classic two-tank setup: a Fleck 5600SXT metered valve on a 10 x 54 in resin tank with 10% crosslink resin and a large separate brine tank.

    Grain capacity48,000 grains*
    Max flow rate14 gpm*
    Control valveFleck 5600SXT metered*
    Warranty5 years*

    * From the seller's Amazon listing; not yet confirmed by the manufacturer.

    Good

    • Fleck 5600SXT valves are sold through many dealers, so parts and service guides are easy to find
    • 10% crosslink resin is more tolerant of chlorinated city water than standard 8% resin
    • Separate brine tank holds a lot of salt

    Not so good

    • Two tanks take more floor space than a cabinet unit
    • In our install, valve programming needed outside guidance and support callbacks took about a day
    • No printed install guide in the box, and the tank label does not show grain capacity

    Skip it if: Small closets, or anyone who wants Wi-Fi alerts and app control.

    Check price on Amazon ($600–$900)Full AFWFilters Fleck 5600SXT 48K reviewSpec score 6.9/10 (provisional)
  2. 2
    Original illustration based on the AFWFilters Fleck 9100SXT Twin 48K's shape and colour — not a product photo

    Why it's here: #9 in hub. A twin-tank Fleck 9100SXT system sold by AFWFilters: two 48,000-grain resin tanks alternate on a metered valve, so one is always in service while the other regenerates.

    Grain capacity48,000 per tank (96,000 total)*
    Control valveFleck 9100SXT, dual metered, twin alternating*
    Resin1.5 cu ft per tank, Purolite C100E*

    * From the seller's Amazon listing; not yet confirmed by the manufacturer.

    Good

    • Soft water around the clock: one tank always online
    • Fleck parts are easy to find and reasonably priced, including on Amazon
    • Metered, on-demand regeneration with no schedule or vacation mode to manage

    Not so good

    • Plastic yoke threads strip or cross-thread easily; buy a spare
    • No PEX yoke option and no left-hand hookup
    • Takes more floor space and costs more up front than a single tank

    Skip it if: Small households or tight utility rooms: a single-tank softener is cheaper and smaller.

    Check price on Amazon ($1,300+)Full AFWFilters Fleck 9100SXT Twin 48K reviewSpec score 2.9/10 (provisional)
  3. 3
    Original illustration based on the DuraWater Fleck 9100SXT Twin's shape and colour — not a product photo

    Why it's here: #10 in hub. A twin-tank softener on the Fleck 9100SXT valve: one tank regenerates while the other keeps supplying soft water.

    Grain capacity48,000 per tank*
    Control valveFleck 9100SXT metered, twin alternating*
    Resin tank10 x 54 in x2*
    Resin1.5 cu ft per tank*

    * From the seller's Amazon listing; not yet confirmed by the manufacturer.

    Good

    • Soft water around the clock, no regeneration downtime
    • Fleck valve parts are widely available
    • Metered, on-demand regeneration

    Not so good

    • Top price band
    • Needs space for two resin tanks plus a brine tank
    • Overkill for most two-person homes

    Skip it if: Anyone happy with a 2 a.m. regeneration.

    Check price on Amazon ($1,300+)Full DuraWater Fleck 9100SXT Twin reviewSpec score 2.9/10 (provisional)
  4. 4
    Original illustration based on the DuraWater Fleck 5600SXT Iron Blaster 48K's shape and colour — not a product photo

    Why it's here: #4 in well. A Fleck 5600SXT system loaded with fine-mesh resin for well water, with a large separate brine tank.

    Grain capacity48,000 grains*
    Warranty60 months*

    * From the seller's Amazon listing; not yet confirmed by the manufacturer.

    Good

    • Fleck 5600SXT valve
    • Fine-mesh resin for wells
    • Large 14 x 36 in brine tank

    Not so good

    • The listing gives no iron limit
    • Two-tank footprint
    • No pre-filter included

    Skip it if: Anyone who needs a stated iron limit to size against.

    Check price on Amazon ($600–$900)Full DuraWater Fleck 5600SXT Iron Blaster 48K reviewSpec score 4.1/10 (provisional)
  5. 5
    Original illustration based on the AFWFilters Fleck 48K + Upflow Carbon's shape and colour — not a product photo

    Why it's here: #2 in combo. The Fleck 5600SXT 48K softener paired with a separate upflow carbon tank.

    Grain capacity48,000 grains*
    Max flow rate12 gpm*
    Warranty5 yr valve, 10 yr tank*

    * From the seller's Amazon listing; not yet confirmed by the manufacturer.

    Good

    • Separate carbon tank, so each stage can be serviced on its own
    • Fleck valve
    • Long tank warranty

    Not so good

    • Top price band
    • Three tanks' worth of floor space
    • Few buyer reports

    Skip it if: Small utility rooms.

    Check price on Amazon ($1,300+)Full AFWFilters Fleck 48K + Upflow Carbon reviewSpec score 5.3/10 (provisional)

Other places to start: the best water softener rankings, well water softeners and the comparison table.