On-Demand RO
On-Demand RO is a car wash reverse osmosis spot-free rinse system with carbon filtration, a 100-gallon buffer tank, repressurization and controls on one stainless steel skid. Production adjusts as your wash uses water from the onboard tank.
Choose Standard Flow, rated up to 18 GPM, or High Flow, rated up to 26 GPM.
Why Operators Choose On-Demand RO
Spot-free water as your wash needs it. All on one skid.
Tank-level feedback adjusts production as the wash uses RO water. The integrated tank and repress pump keep production and rinse-water supply together on one skid.
Flow-on-Demand Production
The 7.5 HP Grundfos VFD production pump adjusts RO production using feedback from the onboard buffer tank
Two Production Capacities
Standard Flow is rated up to 18 GPM and High Flow up to 26 GPM, on softened feed water at 77°F
Built-In Repressurization
A 1.5 HP repressurization pump on the skid delivers spot-free water straight to the wash on a request signal from your tunnel controller, with no separate pump
System Monitoring
The touchscreen HMI and process sensors show system operation and support setup, monitoring and troubleshooting
Integrated System Design
No external tank or repress pump. Less to install and manage.
Carbon Pretreatment
Carbon filtration removes chlorine and chloramines from municipal water to help maintain performance and extend membrane life
Integrated Buffer Tank
A 100-gallon on-skid tank with level monitoring eliminates the need for bulky external storage
Compact, Self-Contained Skid
Production, storage, controls and repressurization on one stainless steel frame simplify installation and save backroom space
Access for Routine Service
A simple series flow path and process sensors help technicians inspect the system and diagnose issues faster
How On-Demand RO Works
On-Demand RO filters and purifies softened feed water, holds it in a buffer tank on the skid, and delivers spot-free water to your wash as the tunnel calls for it.
Softened feed water
Reject
Spot-free rinseTo the wash
Carbon filtersChlorine & chloramines
Production pump
Repress pump
Buffer tank
MembranesPermeate fills buffer tank
- 01Carbon filtersPretreat
Softened feed water passes through carbon filtration on the skid, which removes chlorine and chloramines to protect the membranes. Softening happens upstream.
- 02Production pumpPressurize
A 7.5 HP Grundfos VFD pump pressurizes feed water for the membranes and adjusts its speed in response to the buffer tank level.
- 038-inch membranesPurify
Water runs through the 8-inch membranes in series, which separate it into spot-free RO water and concentrated reject.
- 04Buffer tankBuffer
Spot-free water from each membrane fills a 100-gallon tank on the skid, with level monitoring, so there’s no external storage tank.
- 05Repress pumpDeliver
When your tunnel controller calls for spot-free rinse, a 1.5 HP repressurization pump on the skid sends RO water to the wash.
Specifications
| Specification | Standard Flow | High Flow |
|---|---|---|
| Performance | ||
| Permeate Flow* | 18 GPM | 26 GPM |
| Minimum Permeate Flow (40°F) | 10 GPM | 15 GPM |
| Reject Flow* | 12 GPM | 18 GPM |
| Membranes | 8" commercial membranes, series flow path | |
| Buffer Tank | 100 gallons, on skid | |
| Pumps & Electrical | ||
| Production Pump | 7.5 HP Grundfos VFD | |
| Repressurization Pump | 1.5 HP | |
| Voltage† | 480 VAC / 3 PHOptional: 208 VAC / 3 PH | |
| Max Current | 14 A (480 V) / 24 A (208 V) | |
| Water & Air | ||
| Feed Water Supply | 30 GPM @ 40–60 psi | 45 GPM @ 40–60 psi |
| Feed Water Temperature | 40°F–80°F | |
| Inlet | 1.5" FNPT | |
| Permeate Outlet | 1" FNPT | |
| Reject Outlet | 1.5" FNPT | |
| Air Supply | 3 SCFM @ 80–100 psi | |
| Dimensions | ||
| Skid (W × H × D) | 90" × 74.375" × 36" | 102.875" × 74.375" × 45" |
* Production rates based on a feed water supply of 77°F using softened water.
† Ground required from the facility. Electrical supply must match the selected unit.
On-Demand RO Product Guide
Download a printable overview of On-Demand RO, including key features, specifications and both system sizes.
On-Demand RO FAQs
How much spot-free rinse water does On-Demand RO produce?
Standard Flow is rated up to 18 GPM and High Flow up to 26 GPM, based on softened feed water at 77°F. Actual production varies with feed water temperature and conditions, with minimums of 10 GPM and 15 GPM at 40°F feed water. Our team will help size the system for your demand and water conditions.
How is On-Demand RO different from a storage-tank RO system like the RO10K?
On-Demand RO produces spot-free water as your wash calls for it. A variable-speed pump matches production to demand, a 100-gallon buffer tank sits on the skid, and a built-in repress pump delivers water to the wash. A storage-tank system like the RO10K fills a separate RO storage tank and needs its own repressurization pump.
Does On-Demand RO need a separate storage tank or repress pump?
No. A 100-gallon buffer tank with level monitoring and a 1.5 HP repressurization pump are built into the skid, so there’s no external storage tank or separate repress pump to install.
What pretreatment does On-Demand RO need?
Supply softened feed water. Carbon filtration on the skid removes chlorine and chloramines before water reaches the membranes. Softening is provided upstream, and additional pretreatment depends on incoming water quality.
What utilities does On-Demand RO need?
You’ll need 480 VAC 3-phase power with ground (208 VAC 3-phase optional), feed water at 40–60 psi (30 GPM for Standard Flow, 45 GPM for High Flow) between 40°F and 80°F through a 1.5″ FNPT inlet, and 3 SCFM of air at 80–100 psi.
How does On-Demand RO work with my tunnel controller?
Your tunnel controller sends a request signal that runs the repressurization pump to deliver spot-free water. Separately, the PLC adjusts RO production using tank-level and process sensor feedback. The touchscreen HMI shows operating conditions and lets you fine-tune settings.
Should I choose Standard Flow or High Flow?
We’ll review your peak spot-free rinse demand, incoming water temperature and quality, and available utilities to recommend the right size for your wash.
Complete Your Backroom
Reclaim Gen2
Cleaner reclaim water with greater control over water reuse and day-to-day system operation
dispenseIT Gen2
Chemical delivery in 10, 15, 20 or 25-function configurations, floor or wall mount
HP Pump Stands
Reliable pressure delivery for arches, manifolds, underbody, and other high-pressure wash functions
What to Expect
Discuss Your Application
We’ll review your wash, water conditions, spot-free rinse demand and backroom space to recommend Standard Flow or High Flow
Plan Your System
We’ll plan utilities, pretreatment and placement so On-Demand RO fits your backroom
Installation & Startup
We’ll work with your installation team or distributor to support proper installation, setup and startup of your On-Demand RO
