The S650 OD XP is rated among the world's most efficient water softeners, based on independent WQA testing per NSF/ANSI Standard 44. You'll use less salt and less water while still getting fully softened water throughout your home.
Overdrive runs water through both tanks at once during service, delivering higher flow with less pressure loss. During regeneration, one tank keeps supplying soft water, so you never run out, even with a house full of guests.
Powered by moving water instead of electricity, the S650 OD XP has no timers or computers to set, adjust, repair, or replace. It measures your actual water use and regenerates only when needed, at any time of day or night, and it regenerates with soft water for better efficiency and water quality. It also removes hardness and soluble iron*.
The Kinetico Premier XP® Water Softener is featured on Kinetico Premier XP® S650 OD XP FAQ
- What does "OD" mean in the Kinetico Premier XP S650 OD XP?
OD stands for Overdrive®, a Kinetico technology that sends water through both of the S650's tanks at the same time during normal use. Without Overdrive, a twin-tank softener like the Kinetico S250 XP uses one tank at a time while the other stands by. With Overdrive, the water flow is split evenly between the two tanks, which increases flow, gives the water more contact time with the softening resin and reduces pressure loss through the system. When the softener regenerates, one tank keeps supplying normal service flow. When regeneration is complete, both tanks immediately go back into service. The result is strong water pressure and fully softened water, even when several fixtures are running at once.
- Is the Kinetico S650 OD XP the most efficient water softener?
Yes. The Kinetico Premier XP® S650 OD XP is one of two Kinetico models, along with the Q850 OD XP, rated among the world's most efficient water softeners. The rating is based on independent testing by the Water Quality Association (WQA) per NSF/ANSI Standard 44, the industry-accepted standard for softener efficiency.
It measures the amount of hardness a softener removes per pound of salt, expressed in grains per pound. A higher rating means more soft water from each bag of salt, so the S650 OD XP provides more soft water per bag than any other water softener you can buy. Some brands claim to have the most efficient softener; Kinetico's claim is backed by independent test data.
- How does the S650 OD XP keep water soft during regeneration?
The S650 OD XP is a twin-tank softener, so one tank always keeps supplying soft water while the other regenerates. Regeneration is the process that cleans the hardness minerals out of a softener's resin and restores its softening capacity.
Single-tank softeners are often set to regenerate overnight because they can't provide soft water during the process.
The S650 OD XP can regenerate at any time of day or night without interrupting your soft water supply. It also regenerates with soft water, which improves efficiency and water quality. When regeneration is done, both tanks go back into service together through Overdrive®.
- Does the S650 OD XP need electricity?
No. The S650 OD XP is powered entirely by the energy of moving water, not electricity. There's nothing to plug in, and no timers, computers, or buttons to set, adjust, repair, or replace. A built-in water meter tracks how much water your household actually uses, and the softener regenerates only when needed.
It may regenerate more often when you have guests or are doing extra laundry, and less often while you're away. This demand-based operation avoids wasting salt and water on unneeded regenerations. Because it doesn't rely on electricity, it also keeps working during a power outage.
- Who is the S650 OD XP best for?
The S650 OD XP is designed for larger homes, homes with bigger plumbing, and busy households where several showers, the dishwasher, and the laundry often run at the same time. Because Overdrive® uses both tanks during normal service, the S650 OD XP delivers higher flow with less pressure loss while still fully softening the water.
It's also a strong fit for homeowners who want to keep salt costs and refills down, since it's rated among the world's most efficient water softeners. A local Kinetico water expert can test your water hardness and recommend the right size for your home.
- What is the difference between the S650 OD XP and the S250 XP?
The S650 OD XP and S250 XP are both non-electric, twin-tank Kinetico Premier XP® water softeners that regenerate based on actual water use. The main difference is Overdrive®. The S650 OD XP runs water through both tanks at once during normal service for higher flow and less pressure loss, and it's rated among the world's most efficient water softeners based on WQA testing.
The S250 XP uses one tank at a time, switching automatically to the other tank when one needs to regenerate, so it also delivers soft water 24 hours a day. The best choice depends on your water hardness, household size, and daily water use. A local Kinetico dealer can test your water and recommend the right model.