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500GPD Residential and Light Commercial Under Sink Tankless Reverse Osmosis Water Filter with 1.5:1 Pure to Drain Ratio

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  • 500 GPD 5-stage tankless RO system w/ 1.5:1 pure to drain ratio
  • Removes up to 99% of 1000+ contaminants
  • Lifetime US tech support
  • View More Details
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Product Overview

Filter Type
Fitting Size
Top Contaminants Filtered
Number of Filters
Auto Shut Off
The RCS5T removes chlorine, hardness, heavy metals, toxins, and a long list of other water impurities. It is engineered to meet the needs of light commercial and high demand environments, making it the optimal choice for small restaurants and small businesses. It produces reverse osmosis water at up to 500 Gal. per day, a pace that allows it to function as a tankless system without affecting functionality or convenience. The centerpiece of the system is its RO membrane that receives water from both sides of the membrane housing and is fueled by a high powered booster pump. Higher water pressure to the membrane results in faster RO production and less drain water being rejected. These factors culminate in the RCS5T achieving an exceptional 1.5:1 pure to drain water ratio. The RCS5T can be used with water pressure sources as low as 40 psi, and has a built in pressure gauge to provide an accurate pressure reading. A power source is required for the booster pump, and a holding tank can be added to the system for high usage situations. (Please Note: The RO membrane capacity is affected by the inlet water pressure and water temperature. 500GPD is the maximum rated production rate, not the recommended daily usage amount. The filter replacement schedule is based on average household water consumption of 3 Gal. per day. Filter life decreases if installed in places that require large volumes or continuous water supply).
  • Designed to supply on demand drinking water filtration for large families, small restaurants and small businesses
  • Produces up to 500 gpd or 0.34 gpm under ideal conditions. The actual output could vary from 70% to 90% of the 500Gpd due to temperature, water chemical properties, and other factors. Clean water output is about 10-15 psi on average
  • Patented ro membrane offers consistent output flow with an exceptional 1.5:1 drain ratio
  • 5 stages of filtration remove up to 99% of 1,000+ pollutants including chlorine, fluoride, lead, arsenic, pesticides, pathogens, sulfur, thms, pfoa and pfos
  • Light commercial capable - add a storage tank to increase the flow and provide continuous and stable supply of pure water for light commercial settings

Additional Resources

From the Manufacturer

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Name6-Stage Under Sink Reverse Osmosis Drinking Water Filtration System with Booster Pump and UV Filter, 100GPD500GPD Residential and Light Commercial Under Sink Tankless Reverse Osmosis Water Filter with 1.5:1 Pure to Drain RatioAquus Reverse Osmosis 2-Stage Under-Sink Location Tankless Water Filter System, Smart Faucet 600 Gal. Per Day 1.5:1Tankless Reverse Osmosis Water Filtration System, 500 GPD, Brushed Nickel Faucet, 2:1 Pure to Drain Ratio
Contaminants FilteredLead, Chlorine, Copper, Fluoride, IronLead, Chlorine, Copper, Fluoride, IronBacteriaLead, Chlorine, Copper, Fluoride, Iron
House Hold Size5-6 people8+ people8+ people8+ people
Filtration MethodActivated Carbon,CTO,Carbon Block,GAC,Sediment,Ultraviolet LightActivated Carbon,CTO,Coconut Shell Carbon,GAC,SedimentCoconut CarbonActivated Carbon,CTO,Carbon Block,Coconut Shell Carbon,GAC,KDF,Sediment
Number of filters included5323
Ease of InstallEasy InstallEasy InstallDrilling RequiredEasy Install
Number of Stages6 Stage5 Stage2 Stage3 Stage
IncludesFaucet,Hardware,Installation kitFaucet,Hardware,Installation kitFaucet,Filter,Installation kitFaucet,Filter,Installation kit
Replacement Filter TypeUnder Sink Replacement FiltersWhole House Replacement FiltersUnder Sink Replacement FiltersUnder Sink Replacement Filters
Application TypeFood Service,Office,RV,Water Treatment,Well WaterFood Service,Office,Water Treatment,Well WaterHousehold,Industrial,OfficeFood Service,Office,RV,Water Treatment,Well Water
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Fitting size (in.)
Product Depth (in.)
Product Height (in.)
Product Width (in.)


Application Type
Food Service,Office,Water Treatment,Well Water
Bacteria Reduction (%)
Chlorine reduction (%)
Contaminants Filtered
Lead, Chlorine, Copper, Fluoride, Iron
Copper Reduction (%)
Ease of Install
Easy Install
Automatic shutoff
Filtration Method
Activated Carbon,CTO,Coconut Shell Carbon,GAC,Sediment
Fitting style
Push to connect
Fluoride Reduction (%)
House Hold Size
8+ people
Faucet,Hardware,Installation kit
Iron Reduction (%)
Lead reduction (%)
Maximum feed water pressure (psi)
Maximum feed water temperature (F)
Maximum filtered water flow (gallons per min.)
Minimum feed water pressure (psi)
Minimum feed water temperature (F)
Number of filters included
Number of Stages
5 Stage
Pack Size
Product Weight (lb.)
Replacement Filter Type
Whole House Replacement Filters
Water Filtration System Type
Reverse Osmosis

Warranty / Certifications

Certifications and Listings
No Certifications or Listings
Manufacturer Warranty
30-day money back, 1-year manufacturer warranty, life-time tech support

Questions & Answers

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Customer Reviews

  • 3.4
    out of 19 reviews
  • 80%recommend this product
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Showing 1-10 of 19 reviews
This unit is heavy duty.
This is the 3rd reverse osmosis water purifier I have owned and by far the best made. The metal cage is heavy duty as well as the pump and all of the plastic filter housings. It is easy to install (if you have some plumbing experience and knowledge of how water routes through one of these systems). I was able to install this myself with only one issue that was quickly remedied by calling the help line. Nick was able to trouble shoot accurately within seconds of describing my problem and the system has worked great ever since. I love it because it requires no tank. We haven't bought bottled water in over a month since installing this unit!
    • Recommended
    iSpring Home Water Filtration
    We bought this system 1 year ago and it has worked flawlessly. Our well water had higher than desired arsenic levels so we always bought bottled water from the store in 5 gal jugs. The cost was increasing and it was a constant chore to carry a 50lb bottle of water and set it up evey few days. The ispring system has completely eliminated the need for bottled water. We have plumbed this with a storage tank to the main kitchen sink cold water. We also installed the wsp-100 sediment filter to catch the fines. This also works vey well. The washing machine used to have plugged screens every three to four weeks, now it never plugs.
      • Recommended
      Great bang for your buck$
      I bought this unit due to space requirements and am pretty pleased with my purchase. Installations was easy but the system only comes with a short section of water line so I had to go purchase more. I also had to purchase new fittings for the supply line. Pros: -filters all bad taste out -removes particles from water -needs no tank -easy install -pre assembled so you just need to bolt it on a wall or stand it under your counter Cons: -pump unit is very weak and will require an additional delivery pump to provide faster drinking water flow -cannot be more than 15 feet away from the drinking water tap -pump is noisy when active
      • Verified Purchase
      • Recommended
      Very efficient system
      The system works really great. The portable design helps a lot. And most importantly, the water taste really great.
        • Recommended
        I've have other RO systems before with a tank. This...
        I've have other RO systems before with a tank. This unit works well and the water tastes great as expected. The one complaint I have is that it takes about 30 seconds to get going every time it is used. This is very annoying when trying to fill up a glass of water. Even if it was just used, it starts over every time. But when using a lot of it it's great because it doesn't drain the tank and run out. I wish there was some kind of hybrid system with a tank and the endless component.
        • Verified Purchase
        Top of the line filter with A customer service
        I bought the machine last year before construction was completed. Well during finishing the filter was knocked off the wall and broke on the concrete floor. Nick from their customer service department seen my purchase was in date and was prompt at sending me what I needed. The filter gets my well water to 0ppm and produces more than enough every day.
          • Recommended
          Installed with a 14gal tank and 3/8 tubing. Best...
          Installed with a 14gal tank and 3/8 tubing. Best RO output I have ever seen.
          • Verified Purchase
          Doesn’t increase pressure as advertised...
          Doesn’t increase pressure as advertised
          • Verified Purchase
          It never said the unit needed 110 volts....
          It never said the unit needed 110 volts.
          • Verified Purchase
          RCS5T 500 GPD
          There is a bit of delay after opening the valve. Otherwise works great.
          • Verified Purchase
          • Recommended
          Showing 1-10 of 19 reviews