How Reverse Osmosis Works
Reverse osmosis is a powerful water filtration process that forces water under high pressure through a semipermeable membrane. Only water molecules pass through, leaving behind dissolved salts, minerals, and contaminants. This results in highly purified water collected for use, while waste (brine) containing impurities is discarded or treated separately.
The RO process includes:
- Pre-Treatment: Sediment and carbon filters protect the membrane by removing larger particles, chlorine, and organic matter.
- High-Pressure Filtration: Water molecules are pushed through a 0.0001-micron membrane, rejecting salts and impurities.
- Wastewater Disposal: Concentrated contaminants are flushed away.
- Storage and Delivery: Purified water is stored and dispensed on demand.
What Does RO Effectively Remove?

Our RO systems effectively remove a wide range of impurities, including but not limited to:
- Fluoride
- Arsenic
- Salt
- Chlorine
- PFAS
- Heavy metals
- VOCs
- Microplastics
- Herbicides, pesticides, and more
Turn-Key Solutions with Exceptional Customer Support
We deliver turn-key RO systems that combine advanced equipment, optimized system design, and complete water treatment capabilities. ALSI’s commitment extends beyond installation with ongoing support designed to maintain long-term system performance and reliability.
As RO systems operate, conditions such as fouling, scaling, and operating imbalances can reduce efficiency and increase costs. To address this, ALSI provides RO System Optimization Audits, working directly with your team onsite to evaluate performance, identify issues early, and deliver clear, actionable recommendations.
ALSI support includes:
- Maintenance contracts and ongoing service support
- Job-specific installation drawings
- Replacement membranes and cartridges
- Onsite RO system optimization audits and performance evaluations
- Expert guidance to restore efficiency, reduce operating costs, and extend membrane life
Experience the ALSI difference: custom-designed systems backed by expert engineering and proactive, data-driven support to keep your system operating at peak efficiency.