What does a residential under-sink RO system remove?

AMPAC USA under-sink RO systems reduce TDS by 95 to 98 percent, removing lead, arsenic, fluoride, nitrates, chlorine, chloramines, heavy metals, and dissolved salts. The RO membrane is the primary barrier, supported by sediment and carbon pre-filters that extend membrane life.

How many gallons per day does a residential RO system produce?

AMPAC USA residential RO units produce 50 to 100 gallons per day depending on the model and incoming water pressure. A storage tank, typically 3 to 4 gallons, holds purified water between uses. Production slows in cold water below 55 degrees Fahrenheit.

What is the difference between a 4-stage and a 7-stage RO system?

A 4-stage system includes sediment, carbon pre-filter, RO membrane, and post-carbon polish. A 7-stage system adds stages such as a second carbon block, remineralization filter, alkaline filter, or UV lamp. More stages address specific concerns but also mean more cartridges to replace annually.

How often do I replace filters in a residential RO system?

Pre-filters (sediment and carbon) replace every 6 to 12 months. The RO membrane lasts 2 to 3 years under normal conditions. Post-carbon polish replaces every 12 months. Harder or more contaminated source water shortens these intervals. A TDS meter helps confirm when membrane output degrades.

What water pressure does an under-sink RO system require?

Optimal feed pressure is 60 to 80 PSI. Systems will operate at 40 PSI but produce water more slowly. Below 40 PSI, a booster pump is recommended. High incoming TDS also reduces production rate. Most municipal water supplies fall within the acceptable pressure range without modification.

Reverse Osmosis Water Filtration Systems

Reverse osmosis is the most effective water purification method available for residential use. A standard 5-stage RO system removes 95 to 99 percent of dissolved contaminants including fluoride, nitrates, lead, arsenic, chlorine, chloramines, and total dissolved solids. It does this through physical separation at the membrane level, without chemicals beyond routine filter replacement. The water produced is genuinely cleaner than most bottled water brands, at a fraction of the cost per gallon over time.

AMPAC USA manufactures residential RO systems from 50 to 150 GPD in under-sink and countertop configurations. Units use high-rejection TFC (thin-film composite) membranes, multi-stage pre-filtration to protect the membrane and extend service life, and a final post-carbon polishing stage for best possible taste. Alkaline remineralization is available as a post-treatment option for customers who prefer slightly higher pH output water.

Installation is straightforward: the system connects to the cold-water supply under the sink with a dedicated drinking water faucet on the countertop. No major plumbing work is required. Filter and membrane replacement takes about five minutes without tools. Sediment and carbon pre-filters are changed annually, and the membrane every two to three years depending on feed water quality and daily usage volume.

For homes with whole-house water quality concerns including high hardness, iron, hydrogen sulfide from a well, or heavy chlorine from a municipal supply, AMPAC designs whole-house RO systems that treat all incoming water at the main supply line. These systems range from 300 to 1,500 GPD and require a pressure storage tank and re-pressurization pump for distribution throughout the home, but they eliminate water quality issues at every faucet, shower, and appliance.

Contact AMPAC USA at (877) 611-8530 to find the right residential water purification system for your home. Our team can work from a water test report or help you identify a local testing resource.