Portable Water Purification Systems

Frequently Asked Questions

How to Choose a Portable Water Filtration System

Seven models, three power options, and a GPD range that spans 300 to 3,000. Picking the wrong one means you're either hauling a unit that can't keep up with your crew or paying for capacity you'll never use. Here's how to narrow it down.

Start with flow rate, not the model name

Work backward from headcount. A five-person field team drinking and cooking needs roughly 15-25 gallons a day; a 300 GPD unit covers that with room to spare. A disaster relief shelter housing 200 people needs 2,000+ GPD once you add hygiene and cooking water into the math. Don't size for average demand. Size for peak demand, because a portable filtration system that's undersized on day three of a deployment is a system that fails when it matters most.

One thing people miss: rated GPD assumes clean feed water. Run a 500 GPD unit on turbid river water and actual output drops, sometimes by half, because the system spends more cycles backwashing and less time producing permeate. If your source water is consistently muddy, size up.

RO vs. carbon vs. UV: what each one actually removes

These aren't competing technologies. They're layers, and most AMPAC portable units already stack two or three of them.

• Carbon block pre-filtration pulls chlorine, sediment, and organic compounds that would otherwise clog or foul a downstream membrane. It doesn't touch dissolved salts or most pathogens on its own.
• Reverse osmosis is the workhorse for anything with dissolved solids in it: brackish groundwater, seawater, agricultural runoff with fertilizer residue. It forces water through a semi-permeable membrane under pressure, rejecting salts, heavy metals, and most microorganisms in one pass.
• UV disinfection handles what a membrane pore size might let slip through: bacteria and viruses. It's a chemical-free finishing step, not a standalone treatment, since UV does nothing for turbidity or dissolved solids.

Bottom line: if the water source is fresh and relatively clear, carbon plus UV might be enough. Anything brackish, saline, or unpredictable calls for RO as the core stage. That's also the deciding factor between a countertop-style portable unit and one of our seawater desalination watermakers.

Power source: match it to where the system actually lives

This is where a lot of buyers get burned by spec sheets that assume grid power.

• Grid or generator-fed electric. Standard on most of our TR-series mobile RO units (TR-300, TR-500, TR-1500) and the PCRO-3000. Reliable, consistent pressure, no run-time limits as long as fuel or utility power holds.
• Solar with battery backup. The right call for genuinely off-grid sites: remote wells, agricultural operations without utility access, disaster zones where the grid is down. Our Solar Power Water Filter is built around this, and it pairs with our broader solar water treatment line if you need higher-capacity solar-driven output.
• Manual or hand-pump. The fallback tier for emergency kits and backpack-carried units where batteries and fuel aren't guaranteed. Lower output (think gallons per hour, not per day), but it works when nothing else does.

Solar sounds like the obvious answer until you actually run the numbers on cloudy-day output and battery bank size for your target GPD. Talk to us before you spec a solar system for a use case that really needs consistent high-volume production.

Match the system to the mission

Disaster relief and emergency response usually call for fast deployment and simple operation over raw capacity. Someone with minimal training needs to get the EP-500 or TR-500 running within an hour of arrival. Military and expeditionary use pushes toward our ROWPU-class systems and hardened configurations built for military and government procurement standards. Remote site and off-grid living work leans on solar or generator-backed units sized for sustained daily use, not just a single deployment. Agricultural operations treating brackish well water for irrigation or livestock typically need the higher end of the GPD range (the PCRO-3000 or above), run continuously rather than intermittently.

If what you actually need is a permanent, building-mounted system instead of something field-deployable, our residential and whole-house RO systems are the better fit. No point paying for ruggedized, transportable housing you'll never move.

AMPAC Portable System Comparison

Need trailer-mounted output above 3,000 GPD, or a system that stays parked on-site for weeks at a time? Look at our mobile water treatment systems and mobile water provisioning systems instead. Same underlying RO technology, built for semi-permanent placement rather than carry-and-deploy.