Flash Undersink Reverse Osmosis System with Chrome Lead - Free Faucet - RKIN

Flash Undersink Reverse Osmosis System with Chrome Lead-Free Faucet

Sale price  $329.45 USD Regular price  $499.95 USD
SALE
(32)
Post Filter Option

Enjoy the peace of mind that comes with up to 99% removal of contaminants, including fluoride, chlorine, and heavy metals

Choose from our AlcaPure or OnliPure editions for alkaline pH or zero TDS filtration options

Trust in our NSF/ANSI 58 certified reverse osmosis membrane, 1-year warranty and satisfaction guarantee

1 year satisfaction guarantee

Insured Fast Shipping

Best Price Guarantee

Expert Staff Support

Reverse Osmosis System with Filters

Lead-Free Faucet

3.2 Gallon Storage Tank

1.5" Drain Pipe Saddle

Tank Shut-Off Valve

Faucet Adapter

¼" Tee for Refrigerator Connection

¼" and ⅜" Tubing

⅜" Comp or ½" NPT Diverter Valve

Installation and Product Manual

Flash reverse osmosis filter installation

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.

What are the dimensions of the Flash Reverse Osmosis Filter?

A: Flash R.O. Dimensions - W 5.5", L 14", H 16", R.O. Tank Dimensions - W 11", L 11", H 14.5", R.O. Tank can be placed vertically or horizontally.

Does the Flash R.O. System need an electrical outlet?

No, the Flash R.O. system doesn't have an electric pump but instead uses the natural flow rate of your water supply to channel the water through the filtration process. Therefore, the Flash R.O. system doesn't require electricity to operate.

Can I use another faucet other than the one that comes with the system?

Any faucet specifically made for RO systems with a 1/4" connection would work with the Flash RO system.

What is the difference between AlcaPure and OnliPure Editions?

AlcaPure Edition post filter returns Calcium and Magnesium minerals back to water once it has been purified by Reverse Osmosis membrane. This increases the pH to an alkaline level, similar to spring water.

OnliPure Edition post filter does exactly the opposite - reduces even the tiniest amount of TDS left over after the Reverse Osmosis to zero. This provides lab-grade purified water quality similar to distilled water. Slight variations in the calibration and accuracy of different TDS meters may result in the TDS reading of 1 or 2 PPM. 

For most people, AlcaPure Edition Zero Installation Purifier is the right choice unless you have been accustomed to distilled water taste.

What if I want to switch post-filters of the Flash R.O. later?

Switching from the AlcaPure edition to the OnliPure edition, or vice versa, is as easy as ordering a different post-filter.

How often do the filters need to be changed and how much do they cost?

Please refer to the section below for all details on the replacement filters.

Getting an abnormal filtered water taste is a good indication that the post-filter has been exhausted and needs replacement.

How do I order replacement filters?

If you sign up for the filter subscription program during checkout, the replacement filters will be delivered to you every 12 months automatically. Otherwise, replacement filters can be ordered on our website or over the phone.

Does this system use proprietary filters available only from RKIN and reseller partners?

Yes, we designed our own filters to make filter changes as easy as possible.

Specs

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

  • For indoor non-commercial applications only
  • Protect from excessive cold or heat: do not expose to temperatures below 39°F (4°C) or above 113°F (45°C).
  • Flash R.O. Dimensions - W 5.5", L 14", H 16"
  • R.O. Tank Dimensions - W 11", L 11", H 14.5"

Inlet water quality limits:

  • Max Total Dissolved Solids (TDS) 800 mg/L
  • Max Hardness 25 gpg (428 mg/L)
  • Sulphide, Iron & Manganese <0.1 mg/L
  • Chlorine <4 ppm, pH 3-11, Turbidity 5 NTU Max
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. Subject to in-region item availability and seasonal carrier shipping performance.

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 1-year satisfaction guarantee, which includes a warranty for the same period.

Free shipping on warranty replacements. Learn more

Specs

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

  • For indoor non-commercial applications only
  • Protect from excessive cold or heat: do not expose to temperatures below 39°F (4°C) or above 113°F (45°C).
  • Flash R.O. Dimensions - W 5.5", L 14", H 16"
  • R.O. Tank Dimensions - W 11", L 11", H 14.5"

Inlet water quality limits:

  • Max Total Dissolved Solids (TDS) 800 mg/L
  • Max Hardness 25 gpg (428 mg/L)
  • Sulphide, Iron & Manganese <0.1 mg/L
  • Chlorine <4 ppm, pH 3-11, Turbidity 5 NTU Max
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. Subject to in-region item availability and seasonal carrier shipping performance.

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 1-year satisfaction guarantee, which includes a warranty for the same period.

Free shipping on warranty replacements. Learn more

Flash Undersink Reverse Osmosis System with Chrome Lead-Free Faucet
  • Enjoy the peace of mind that comes with up to 99% removal of contaminants, including fluoride, chlorine, and heavy metals

  • Choose from our AlcaPure or OnliPure editions for alkaline pH or zero TDS filtration options

  • Trust in our NSF/ANSI 58 certified reverse osmosis membrane, 1-year warranty and satisfaction guarantee

$499.95 USD $329.45 USD Sale

Shipping calculated at checkout.

View Full Details

Honest Reviews

Mario C.

Replacing the old spout was easy even the installation of the new one.

Janet C.

Very happy with this product. Have used it for 2 years. As we cannot fit an under counter water purifier...

Eric A.

100% would recommend this company, team, and products! Everything has been perfect. The water is so tasty and also appreciate...

Not sure which whole‑home system? Get a custom plan in 30 minutes.

Schedule my 30‑min consultation

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.

  • Fast: Book a 30‑minute consult at a time that works for you.
  • Clarity: City or well water, scale, smells, stains - we’ll match the right fix for your home.
  • No risk: No obligation. If we can’t improve your water, we’ll tell you.
Schedule my 30‑min consultation

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