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Apr 27, 2016·6 min read
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Residential Water Filtration Systems

How Whole House and Under Sink Reverse Osmosis Drinking Water Filtration Systems Works?

Sammy FaragAMPAC USA — April 27, 2016

How Whole House and Under Sink Reverse Osmosis Drinking Water Filtration Systems Works?

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Whole house and under-sink reverse osmosis systems work by forcing pressurized water through a semipermeable membrane that blocks up to 99% of dissolved contaminants. Under-sink systems serve a single drinking water point, while whole-house systems treat all household water at the main supply line, protecting plumbing, appliances, skin, and drinking water simultaneously.

Raw or tap water consists of hazardous impurities such as bacteria, chemicals, salts. These contaminants can result in serious diseases.

To keep your home safe, what you need is a filtration system that does not eliminate only one type of impurity, but it reduces all kinds of contaminants. Reverse Osmosis water filter system is a solution designed to purify even the most decontaminated form of water.

Ampac’s Reverse Osmosis water filtration systems are fully capable of removing a wide range of bacteria, virus and chemicals. Not only that, our Reverse Osmosis purifiers are built using the most reliable materials which help in removing extremely dangerous metals including Fluoride and lead from tap water.

Whole House Reverse Osmosis

A Whole House Reverse Osmosis system extends pure water throughout your home or facility instead of being confined to just one point like your kitchen. This ensures pure water in all applications including drinking, cooking, cleaning and more. Ampac USA delivers whole house Reverse Osmosis systems which are customized to suit your requirements in the best way. We test your current water conditions carefully before a system that can adequately remove the identified impurities.

In addition to homes, our commercial Reverse Osmosis systems are widely used for hospitals, schools, restaurants, coffee shops, manufacturing facilities, offices and a lot more.

What makes Ampac USA highly reliable for Whole House Reverse Osmosis systems?

  • Customizability: We create an absolutely on-target water filtration and purification system depending on the contaminants present in the water source, consumption and conditions.
  • Quick Installation: simplicity and ease of use enable quick installation and operation so that you start using highly pure water without having to wait too long.
  • Low Maintenance: The materials we use are genuine and durable enough to serve you for long periods. Our equipment does not require frequent maintenance.

Under Sink Reverse Osmosis Systems

However contaminated your home water supply is, our Reverse Osmosis systems for homes will give you safe and quality water each time. Implementing the most advanced membranes, our Under Sink Reverse Osmosis Systems eliminate all kinds of contaminants from tap water. The under sink arrangement consumes very limited space and allows easy installation. Depending upon the requirement, you can choose any one out of Ampac’s 3, 4, 5 or 6 stage systems.

Here’s why Ampac’s Under Sink Reverse Osmosis Systems are great for you home:

  • Advanced Features: Our purification systems come with several convenience inclusions such as quick connect fittings, integral shut-off, high flow tubing and much more.
  • Quick Installation: Just an hour or two and we’re all set. Our Under Sink Reverse Osmosis systems come with smartly designed hardware fittings which enable easy and quick installation.
  • Excellent Storage & Capacity Configuration: Offers up to 100 gallons per day for your home
  • Highly Durable: All our systems offer unmatched durability that can withstand even the toughest conditions

What flow rates are available for emergency water treatment?

AMPAC USA's emergency systems range from 1,500 GPD portable units to 50,000+ GPD trailer-mounted systems. Military-specification units are available for forward operating base deployment, producing potable water meeting EPA and WHO drinking water standards from virtually any source.

Are emergency RO systems suitable for disaster relief operations?

Yes. AMPAC USA's emergency systems are used by FEMA, the U.S. military, and international NGOs for disaster relief. They treat flood water, contaminated groundwater, and brackish sources, removing bacteria, viruses, and chemical contaminants to produce safe drinking water on-site.

What power sources can emergency water purification systems use?

AMPAC USA's emergency systems can run on generator power (120/240V or 480V 3-phase), solar panels with battery backup, or vehicle power take-off (PTO). Low-power models consume as little as 0.5 kW, making them viable for off-grid deployment.

How durable are military-grade water purification systems?

AMPAC USA's military systems are built to MIL-SPEC standards with stainless steel frames, powder-coated components, and UV-resistant materials. They are designed to operate in temperatures from -20°F to 120°F and are vibration-tested for transport in military vehicles.

Conclusion

This post highlighted how emergency and military-grade water purification systems provide safe drinking water rapidly in the most challenging field conditions. For organizations requiring deployable water treatment capability, AMPAC USA engineers portable and trailer-mounted systems built to perform wherever they are needed. Contact our team at info@ampac1.com or (909) 548-4900 to discuss your emergency water treatment requirements.

How Reverse Osmosis Filtration Works: Under-Sink vs. Whole House

Both under-sink and whole-house RO systems share the same core technology: a thin-film composite (TFC) polyamide membrane with pores small enough to block virtually all dissolved solids, bacteria, and most viruses. The key difference is placement and capacity. Under-sink systems (50–200 GPD) treat water at the point of use—typically the kitchen sink and a dedicated RO faucet—while whole-house systems (500–3,000 GPD or more) are installed at the main water entry point, treating every faucet, shower, appliance, and outdoor spigot.

A standard 5-stage under-sink RO system processes water through: (1) 5-micron sediment pre-filter to protect the membrane from particles, (2) granular activated carbon to remove chlorine and organics, (3) carbon block for additional chemical polishing, (4) the TFC RO membrane itself—the heart of the system—operating at 60–80 PSI house pressure to achieve 95–99% TDS rejection, and (5) a post-carbon polish filter on the 3.2-gallon atmospheric storage tank. Whole-house systems add a booster pump to maintain adequate pressure across all usage points simultaneously.

Pressure drop, flow restriction, and wastewater generation (reject water at roughly 3:1 waste-to-product for standard membranes, improving to 1:1 with permeate pumps) are the trade-offs for whole-house RO. AMPAC USA whole-house systems use high-efficiency membranes and permeate pumps to achieve 50%+ recovery rates, dramatically reducing water waste compared to traditional RO design.

Frequently Asked Questions

What is the difference between whole house and under-sink RO?

Under-sink RO treats water at a single kitchen faucet (50–200 GPD). Whole-house RO treats all household water at the main supply, providing purified water at every tap, shower, and appliance—but requires a larger system and higher upfront investment.

How many stages does a whole house RO system need?

Whole-house systems typically use 4–7 stages: sediment pre-filtration, carbon pre-treatment, antiscalant dosing (for hard water), multi-element RO membrane array, UV disinfection, and post-carbon polishing. Remineralization is recommended for drinking water quality.

Does whole house RO waste a lot of water?

Older designs reject 3 gallons for every 1 purified. Modern AMPAC systems with high-efficiency membranes and permeate pumps achieve 50%+ recovery—comparable to water softeners—making whole-house RO viable in water-conscious communities.

What pressure is needed for an RO system to work?

Standard RO membranes require 60–80 PSI feed pressure. Most US homes supply 40–80 PSI. If pressure falls below 50 PSI, a booster pump ensures optimal flow rate and rejection performance.

Can a whole house RO system replace a water softener?

Yes. RO membranes remove calcium and magnesium (hardness minerals) more effectively than ion-exchange softeners—without adding sodium to the water. For households on sodium-restricted diets, whole-house RO provides softening benefits without the health drawbacks of salt-based systems.

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