The Fleck 5600SXT 64,000 Grains Water Softener is among the best-rated water softeners for 2021.

It is not the cheapest of the water softening systems, but if you have hard water with a high grain rate, it could be the best way to reduce all the adverse effects it has on your health, wellbeing, and your clothing, appliances, furniture and dishes.

With a water softening system like the AFWFilters Fleck 5600 SXT 64K Grains, you will prolong the longevity of your washing machine, water heater, dishwasher, and all other appliances which use water.

You will also eliminate all the unsightly water spots, soap scum, and scale from your sinks, toilets, shower and others.

Plus, the buildup of scale in the pipes will be dissolved, and the water will flow freely through your plumbing system once again.

Without the harmful buildup and with the harmful minerals removed from your water, you will reduce the risk of being exposed to dangerous heavy metals, chemicals, and minerals, like arsenic, barium, lead, fluoride and others.

So, in the long run, investing in the Fleck 5600 SXT 64K can save you a ton of money for repairs and new appliances for cleaning detergents, as well as for medical bills.


The Fleck 5600 SXT Water Softening system is of premium quality and is very easy to set up and run. This is mainly due to its user-friendly digital touchpad controls and display control head which comes in the set.

The system has easy to program cycle options. It also features the new and upgraded paddle wheel meter, which helps improve the water flow while it is being softened and the minerals are being removed.

The maintenance of the Flex 5600 SXT is pretty straightforward. For a household with four members, you will need to add a bag of salt every month.

The brine tank capacity is for up to 4 bags of salt.

The size of the system is 52 x 12 x 12 inches, the resin tank is 12 x 48 inches so that it will fit in just about any home.

One of the best features of this premium quality water softener is that the polyglass resin tank is sold with a 10-year warranty, so you can rest assured that your investment will be protected for at least a decade to come.

What exactly does the Flex 5600SXT remove?

This water softening system will remove the hardness, aka CaCO3 from the water running in your home. It transforms the calcium and magnesium ions from the water into sodium or potassium ions, and thus eliminates the hardness.

The resin used in the media for softening, exchanges all of the sodium and potassium ions. During the backflushing process, the trapped calcium and magnesium ions are flushed down the drain and completely removed from the water running in your home.

Thanks to the control head of the system, this entire regeneration process is entirely automated and is used only when there is a need for hardness removal.

By removing these mineral ions, the system prevents the buildup of scale inside the pipes and inside all of your appliances, which use water.

While the system is capable of removing some of the iron in the water, it does not remove it completely, neither does it remove any sulfur from the water, but after all, this is a water softener and not a whole house water filter.

What does a 64,000-grain capacity mean?

Water hardness is measured in the number of mineral grains per gallon (GPG) in the US. If you live somewhere where the measurements are metric (parts per million ppm or mg/L), then you will need to divide your rating by 17.1 to get the GPG rating of your water.

The Flex 5600SXT 64K has the capacity of removing 64,000 grains of hardness from your water.

The 64,000 system is suitable for households with 5-7 inhabitants, and a water hardness of 45-65 GPG. Of course, this is an estimate for families with an average water use. If your home uses fewer gallons per minute (GPM), you may want to opt for the smaller capacity 34K or 48K versions of the system.

The GPM service flow capacity of this system is 16 GPM.

The smart regeneration system

This top-quality water softening system has an intelligent and innovative regeneration system that regenerates and flushes only the amount of water needed from the tank, based on the water usage of the household.

This helps save water and money, so it is good for the environment and for your wallet too.

Plus, you can further adjust the settings of the unit, in accordance with your personal preferences and water use.

The digital controller of the system is integrated into the main valve and will provide exact readings, so the water consumption and the water waste will be minimized.

The SXT digital controller

The digital controller is what sets the Fleck 5600SXT apart from most other water softening systems. It is intuitive, and easy to use, and has a set of useful preprogrammed and also customizable parameters so you can adjust the settings to your preferences and needs without hassle.

There is an easy to view backlit LCD, which makes setting up and fine-tuning the water softening system even easier.

It has a straightforward interface, as well as a built-in emergency battery for power failures too.

The tanks

The resin tank is 12 x 48 inches in size, and the set also includes a larger round brine tank, which has a capacity of up to 250 lbs. of salt.

It has a built-in safety float, which will prevent any overflows and overfilling to keep your home safe and mess-free.

Made of durable polyglass in the USA, the resin tank is sold with an industry-leading 10-year warranty.

The installation

AFWFilters have designed this salt-based water softening system to be easy to install by DIYers. It features simple connections and comes with detailed installation instructions.

Of course, if you prefer, you can hire a professional plumber to install your system. The installation process shouldn’t last for more than 1-2 hours.

The price

Although it is not among the cheapest of all water softening systems of this type and range, it is safe to say that the Fleck 5600SXT is a worthwhile investment if you have hard water and want the best solution for your problem.

This system is very sturdily built of high-quality materials in the USA. It features the latest modern technologies for easy control and for water-saving and comes with a very attractive warranty of 10 years. The warranty on the valve is 5 years which is a very good deal as well.

The company also offers professional and useful customer support for the lifetime of the system.

What is included in the package?

One of the top advantages of this water softening system is that it comes with pre-loaded 2 cubic ft. of 8% Crosslink high capacity resin. This eliminates the need to load it yourself.

Also, in the set, you will receive the tank itself, a riser tube and distribution basket, a larger brine tank with a safety float, a digital control head, and a variety of connectivity options, and a bypass valve.

Final verdict

The high-end Fleck 5600SXT can be a pretty significant investment, but given its quality, efficiency in softening the water, as well as its ease to use, it is among the best water softening systems available on the market for 2021.

It has some high tech features which will help you set it up, program it, and run it smoothly and per your preferences.

It will soften your hard water while conserving water. It will also help you save money for pipe and appliance replacements and repairs and will deliver soft water to all faucets, showers, toilets, and appliances 24/7.


Valerie Vinton

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