Are you interested in buying a Fleck 9100SXT water softener?

Well, you came to the right spot on the internet. This article will provide a detailed review of the Fleck that covers the features, installation, what we like, and what we don’t like.

This article is part of a larger series on water softeners. Click here if you want to see our full guide on purchasing a water softener.


The 9100SXT is one of the higher end models that Fleck makes. And Fleck makes some nice softeners. In fact, it is the nicest (and most expensive) model that they offer.

The main selling point of this particular unit is the dual resin tanks. Other specification include the following:

  • Capacity: 192,000 grain (two 96,000 grain resin tanks)
  • Method: Ion-exchange
  • Resin Tank(s) Dimensions: 14” x 65” (2 tanks)
  • Resin Capacity: 3 ft³ (6 ft3 total)
  • Brine Tank Dimensions: 18” x 40”
  • Brine Tank Capacity: 350 lbs of salt
  • Display: Digital
  • Flow Rate: 20GPM
  • Preloaded resin? Yes
  • Warranty: 5 years for digital control valve. 10 years for tank.

What We Like

fleck 9100sxt digital valve with numbers

There is a lot to like with this system. As you can see from the specs listed above, it has alternating resin tanks that can each store 3 ft³ of resin. This makes it unlikely that you will ever run out of resin while using your water.

One resin tank pulls water while the other tank regenerates. You never run out of water with this type of system.

What is even better is that the 9600SXT control valve has a digital display. Now, that isn’t particularly special, most units have a digital display valve. The amazing part is that this system regenerates based on the amount of resin inside the tank. Compare that to the lower tier models that regenerate at a set time.

You might think that regenerating at a certain time can lead to some resin shortages… and you’re correct. That is one of the biggest issues with those types of systems.

Anyway, we also like the fast flow rate. This makes the regeneration process even faster, which also decreases the likelihood of having a drop in water pressure while taking a shower. No one likes low water pressure showers. Trust me.

Finally, the warranty is nice. Fleck always does the 5 year valve warranty and the 10 year tank warranty. Honestly, you shouldn’t need to use either of those warranties because the entire unit only has one moving part. The biggest issue you might have is some corrosion on the tanks… after about 15 years.


Well, Fleck claims this is a DIY install, which might be true if you work as a plumber. However, the average office worker American will probably have a difficult time installing a water softener. It require sweating copper and cutting pipes.

It isn’t difficult outside of those two tasks listed above. Keep in mind, if you do those steps wrong, then you will have some big leaks. We recommend hiring a plumber to install this if you do not feel comfortable with those steps.

The one exception is that if you already have the pipes cut. Usually this is because you already have a water softener installed and are just looking for a replacement. In that case, you can (somewhat) easily install a softener. I mean, you will still need a wrench, but you shouldn’t need pipe cutters or a blowtorch.

Here is an instructional video for those that still want to install this yourself:

What We Don’t Like

There really isn’t that much to not like. The main thing we don’t like is the price… it’s expensive. It’s worth the added price because of the large capacity and auto-regeneration, but it’s still at the higher end of the market.

We also don’t like the massive size of this unit. It has three tanks (two resin, one brine), which take up a bunch of space. Make sure to plot out space before installing this in your home. Again, the added capacity is nice and a necessity for larger households. If you want a smaller unit, then check out some of the other softeners that we cover. The Fleck 5600SXT is a good start.

fleck 9100sxt with two chrome resin tanks and a brine tank

The massive size also comes with a higher monthly maintenance cost. Honestly, it still isn’t that much money per month because salt is so cheap. However, this expense is definitely something to keep in mind before making your purchase.

You should budget about $250 per year in maintenance costs for a water softener of this capacity. It might be lower than that, but we give you the higher end of the range to avoid any shock. That is just how we do business here at Water Purification Hub.

Frequently Asked Questions

Can this be installed outside?
Yes. Just use a cover.
Do I set the capacity to 32,000 or 64,000?
Set it to 64,000 because this is a 64,000 grain unit.
Is it automatic?
Yes. Everything is automatic. When one tank is empty is switches to the full tank to let the empty one regenerate.

Final Verdict

Ah, the final verdict. My favorite part of these articles.

Our final verdict is purchase this unit if you have a large household, have a bigger budget, and adequate space to place this unit in your home. Also, the maintenance will be slightly more for this unit. It will use around two or three bags of salt per month, which should cost about $15 to $20 per month.

All in all, the Fleck 9100SXT really isn’t a system for those looking for the lowest cost option. Nor is it a good fit for those that live in a smaller home. Make sure to fully understand your needs and any alternatives before making this purchase.