OnliSoft Pro Salt-Free Water Softener and Whole House Carbon Filter System - RKIN

OnliSoft Pro Salt-Free Water Conditioner and Whole House Carbon Filter System

$2,173.50 $2,999.00

SALE

(21)

Assembled in the USA

Lifetime Warranty

Certified Components

Size 1-3 Bathrooms 2-5 Bathrooms 4-6 Bathrooms 7+ Bathrooms

1-Year Satisfaction Guarantee

Insured Fast Shipping

Best Price Guarantee

Expert Staff Support

Enjoy filtered water throughout your entire home that tastes better and makes your food taste better too

Showers and baths without chlorine & other disinfection by-products that can damage your skin and hair

Protect your home against hardness build-up with a lifetime warranty on tanks & valves

Super Flex Installation Kit for Dual Tank Whole House Water Treatment System

$198.99 $169.95

Flash Undersink Reverse Osmosis System with Chrome Lead-Free Faucet

$499.95 $329.45

Stainless Steel High Output UV Water Disinfection System

$930.38

Stop scale, smells, and stains - talk to a water pro and get your best‑fit system.

In 30 minutes, an RKIN Whole Home specialist will review your water, compare options, and give you a clear recommendation with pricing and installation options - zero pressure, no obligation.

What You Get:

Clarity
Exact model, estimated costs, DIY vs. pro install guidance.
Diagnosis
City or well - identify the real cause (scale, iron, sulfur, chlorine).
Confidence
Straight answers on maintenance, warranties, and timelines.

Schedule my 30‑min consultation

Prefer to talk now? Call 1‑800‑803‑4551 (Mon–Fri, 9 AM–5 PM EST)

RKIN free whole house water system consultation

RKIN OnliSoft Pro Whole Home Filtration System

Filters Out Harmful Contaminants

Remove up to 99.6% of chlorine and other contaminants with our whole house water filter system. It has multiple lines of defense against harmful chemicals and pollutants, including:

Taste, Odor, Chlorine, Chloramine, Haloacetic Acids, MTBE & THM's, Herbicides, Pesticides, and many others.

Softer Skin & Healthier Hair

Eliminate contaminants in the water that can be harmful to your body. By filtering chemicals such as chlorine and chloramine, you can avoid the drying effects of chemicals, promoting softer skin and healthier hair.

Why Use a Water Softener

The mineral build-up, or scale, can occur in plumbing and household appliances when your water is hard. Solid deposits of calcium carbonate can form when hard water is heated. This scale can reduce the life of appliances, raise the cost of heating your water and clog pipes. Long-term movement of hard water through a pipe results in scale buildup. This can gradually close up the pipe and lower your water pressure.

Comes Install-Ready

All our products come install-ready with minimal assembly required.

RKIN whole house water systems are manufactured in the USA and are made to be installed easily without needing professional help. However, we do recommend hiring a plumber if you are not mechanically inclined.

OnliSoft Tank
ZEE Pro Filter Housing
ZEE Pro Sediment Filter
Sediment Filter Wrench
Bypass Valve
Two 1" MNPT PVC Elbow Fittings
Hose Bib Assembly
ZEE Pro Mounting Kit
Installation and Product Manual

OnliSoft Tank
ZEE Pro Filter Housing
ZEE Pro Sediment Filter
Sediment Filter Wrench
Bypass Valve
Two 1" MNPT PVC Elbow Fittings
Hose Bib Assembly
ZEE Pro Mounting Kit
Installation and Product Manual

Whole house carbon filter

Chlorine and chemicalsHeavy metalsSedimentFiltered water

Water travels down the center tube and rises through the media.
Designed to remove organic contaminants and disinfectant by-products such as chlorine and chloramines.
Creates a bacteriostatic environment using copper and zinc alloy which helps with the removal of chlorine and heavy metals.
Innovatively designed to maximize water treatment by substantially increasing contact time with the water filtration media.
Designed to filter out sand, silt, clay, and any other sediment.

Expand all stepsCollapse all steps

OnliSoft salt-free conditioner

Calcium and magnesiumInactive crystals

Hard water flows down the center tube and up through the OnliSoft media.
The OnliSoft media naturally neutralizes hardness minerals through Seed Assisted Crystallization.
These deactivated particles that are suspended in the water pass through and ultimately exit the entire household plumbing system.
The OnliSoft media is non-absorbent. It will work for a lifetime and doesn't require replacements or maintenance. The Zee Pro sediment filter is still replaced on schedule.

Expand all stepsCollapse all steps

Carbon Filter Tank
Bypass Valve
Two 1" MNPT PVC Elbow Fittings
Installation and Product Manual

Carbon Filter Tank
Bypass Valve
Two 1" MNPT PVC Elbow Fittings
Installation and Product Manual

Super Flex Installation Kit for Dual Tank Whole House Water Treatment System

$198.99 $169.95

Optional RKIN Super Flex Kit makes installation faster and easier. Eliminates the need to perfectly measure, cut, and glue pipes. Just place the water system next to the main water line and connect...

View Full Details

RKIN OnliSoft Pro Saltless Water Softener Carbon Filter Combo is featured in the videos below. The Well Water Filter and/or Salt Based Water Softener installation will be very similar, with additional drain and electrical outlet required.

Does the RKIN OnliSoft Whole House Water Conditioning System add anything to the water?

No, it doesn't. The OnliSoft Whole House Water System neutralizes hardness via Seed Assisted Crystallization and protects your appliances from hardness build-up.

What is OnliSoft?

OnliSoft is a maintenance-free filtration media designed to prevent scale build-up by transforming hardness molecules into harmless minerals that no longer cling to household and appliance plumbing surfaces. This is accomplished without adding anything to the water, such as salt, acids, or any other chemicals.

How it works: The OnliSoft media naturally neutralizes hardness minerals through Seed Assisted Crystallization. This process of capturing, accumulating, and transforming the hardness minerals into inactive microscopic crystal particles occurs without introducing additional substances. These deactivated particles that are suspended in the water pass through and ultimately exit the entire household plumbing system.

The OnliSoft media is non-absorbent and will work for a lifetime. This means that there are no replacements or maintenance required.

Does the RKIN OnliSoft Whole House Water Conditioning System require any maintenance?

The OnliSoft Whole House Water Conditioning System requires no maintenance and is a great money saver. It needs no electricity to operate and produces zero water waste. And since our water treatment system is salt-free, it doesn't require the yearly maintenance hassle and cost that is involved with standard salt softeners.

ZEE Pro Sediment Pre-filter will require replacement. Please below.

Who installs my RKIN Water System?

RKIN ships direct from the factory, saving you over 60% of the standard retail cost. Our products' user-friendly design makes installation easy with or without professional help. However, if you're not mechanically inclined, we do recommend hiring a plumber to help with installation.

Learn more about RKIN installation services, currently only available in southwest Florida.

When I move, can I take my RKIN Water System with me?

The RKIN easy-install design makes moving the system between houses a breeze. Just put the system into bypass mode, disconnect it, and take the system with you. The system can be re-installed in your new home with or without professional help.

Do you have a technical service help desk?

Yes, RKIN's technical support staff is available by phone at 1-800-803-4551, via the contact form, and through live chat, Monday to Friday from 9 am to 5 pm EST. You can also reach us at any time by e-mail with any questions or concerns. Product-specific technical information is also available on each product page, which includes Installation Guides, Product FAQ, and Specifications.

Why should I get my water filter system from you?

RKIN specializes in well-built, user-friendly filtration systems made in Florida. Backed by guarantees that go above and beyond industry standards, each of our products comes with an industry-leading lifetime warranty and an unmatched one-year satisfaction guarantee.

Another factor that separates us from the competitors is our renowned customer service. Conveniently placed in Fort Myers, FL, our home office allows us to provide our customers with reliable and easily accessible help if needed.

How long will it take for me to receive my order?

We provide tracking numbers for all orders via email. All orders usually ship on the same or the next business day. But, sometimes, it might take us up to 5 business days to ship your order. Depending on where you are located, the product may take up to 5 business days to be delivered to your home. The whole home systems are usually shipped via UPS ground or Palletized Freight depending on the water system type and your location.

What if I have more questions or need support?

Contact customer support.

RKIN 20" 5 Micron PP Sediment Filter for Whole House Water Filtration

$38.28 Buy Now

O-Ring Kit for ZEE PRO Filter Housing

$9.95 Buy Now

Replacement Carbon Media

From $169.95 Buy Now

Specs

Onlisoft Pro OPX8, OPX9, OPX10 Salt-Free Whole House Filter Combo System Manual

Onlisoft Pro OPX13 Salt-Free Whole House Filter Combo System Manual

⚠ IMPORTANT: Before installation, the carbon media inside the tank needs to be soaked in water for a MINIMUM of 2 days.

⚠ CAUTION: Do not install on well water without checking with the RKIN customer service representative first.

If the water being filtered is from a public water supply, it will comply with requirements, and your RKIN Water Treatment System will substantially improve the water quality.

Whole House Carbon Filter and Water Softener RKIN OnliSoft Pro Combo System Models
System	OPX8: 1-3 Bathrooms	OPX9: 2-5 Bathrooms	OPX10: 4-6 Bathrooms	OPX13: 7+ Bathrooms
Carbon Media Capacity	500K Gallons or 10 Years	1 Million Gallons or 10 Years	1 Million Gallons or 10 Years	1 Million Gallons or 10 Years
Zee Pro Pre-Filter Replacement	Every 12 Months	Every 12 Months	Every 9-12 Months	Every 6-9 Months
Tank Width And Height With Head	8" x 48"	9" x 52"	10" x 58"	13" x 58"
Connection Size	1"	1"	1"	1.5"
Flow Rate	9 GPM Service / 12 GPM Peak	11 GPM Service / 17 GPM Peak	15 GPM Service / 23 GPM Peak	28 GPM Service / 41 GPM Peak

Salt-Based vs Salt-Free RKIN Water Softener Comparison
Water Softener	Salt-Based	Onlisoft Salt-Free
Salt replenishment is required	Yes	No
Drain is required	Yes	No
Electric outlet is required	Yes	No
Metered Operation for Water and Salt Efficiency	Yes	Not Applicable
Bluetooth and Mobile App	Yes	Not Applicable
Bluetooth can be disabled	Yes	Not Applicable
Acid or any other chemicals added	No	No
"Soft" feeling water	Yes	No
Hardness removed from the water	Yes	No, it’s neutralized via Seed Assisted Crystallization
Prevents hardness build-up	Yes	Yes

Operating Temperatures	Operating Pressure	pH Range
36°F-120°F	25-80 PSI	6.5-10

Shipping & Delivery

Free standard shipping within the contiguous United States (lower 48 states).

Orders are usually shipped the same or the next business day and delivered within 2–5 business days. Sometimes shipping can take up to 5 business days, and some deliveries, including international orders, can take 7–14 business days. The whole home systems are usually shipped via UPS ground or Palletized Freight, depending on the water system type and your location.

Order tracking numbers are emailed as soon as they become available. If you do not receive your tracking number within 24 business hours, please check your spam folder.

Price Match Guarantee

We work diligently to make sure that we offer the best prices for our products online. If you come across another retailer offering a lower price for our products than we are within 12 months of your purchase date, please let us know, and we will refund you the difference in price.

We want you to feel confident that you are getting the absolute best price for the product you are ordering from us. If you find that our own website, www.rkin.com, has lowered the price for the same item you ordered within 12 months of your purchase date, please let us know, and we will refund the difference in price.

Warranty & Returns

You get an unconditional one-year satisfaction guarantee with every RKIN whole-house water treatment system.

Lifetime Warranty included on Tanks and Parts. Free shipping on warranty replacements.

The Electronic and Mechanical Control Valves are warrantied for 7 years.

OnliSoft Pro Salt-Free Water Conditioner and Whole House Carbon Filter System

$2,999.00 $2,173.50 Sale

Size

Enjoy filtered water throughout your entire home that tastes better and makes your food taste better too
Showers and baths without chlorine & other disinfection by-products that can damage your skin and hair
Protect your home against hardness build-up with a lifetime warranty on tanks & valves

View Full Details

Real Reviews from Real Customers

Customer Reviews

4.7 Based on 21 Reviews

5 ★

90%

19

4 ★

0%

0

3 ★

0%

0

2 ★

5%

1

1 ★

5%

1

Customer Photos

OnliSoft Pro Salt-Free Water Softener and Whole House Carbon Filter System - Customer Photo From James

OnliSoft Pro Salt-Free Water Softener and Whole House Carbon Filter System - Customer Photo From Luis Angel Arroyo

OnliSoft Pro Salt-Free Water Softener and Whole House Carbon Filter System - Customer Photo From Omar C.

OnliSoft Pro Salt-Free Water Softener and Whole House Carbon Filter System - Customer Photo From Bradford B.

OnliSoft Pro Salt-Free Water Softener and Whole House Carbon Filter System - Customer Photo From Marcus Mckee

OnliSoft Pro Salt-Free Water Softener and Whole House Carbon Filter System - Customer Photo From Thomas P.

OnliSoft Pro Salt-Free Water Softener and Whole House Carbon Filter System - Customer Photo From Phong Huynh

Write a Review Ask a Question

Not Sure Which Whole‑Home System?

Get a custom plan in 30 minutes. Talk to an RKIN water specialist—zero pressure. We’ll assess your water, compare options, and give you a clear recommendation with pricing and install fit.