VIQUA Arros 22 UV Sterilizer — 22 GPM

Description

The largest chamber in the Arros line at 22 GPM. Worth being clear about its ceiling: this is still a residential and light-commercial system. A facility running an FMHC-scale RO produces more than this can treat in one pass, so on a large build it belongs on a distribution leg rather than the main line.

Ultraviolet is the one treatment step that kills biology without touching your water chemistry. Nothing is dosed, nothing is left behind for your feed recipe to account for. Water passes a lamp, the organisms in it stop being able to reproduce, and everything else about the water is exactly as it was.

UV removes nothing, though. It is not a substitute for filtration — it inactivates what is alive and leaves everything else in place.

Flow rate depends on the dose you need

UV is not rated at a single number. The same chamber treats more water at a lower dose, and dose is what decides what you actually kill. These figures are at 95% UVT, at end of lamp life.

The model number is the rating at 30 mJ/cm². If you are treating water you have reason to distrust, size against the 40 mJ/cm² row instead — this unit is a 16 GPM system at that dose.

Arros 22 specifications

UVT matters as much as flow

Those ratings assume 95% UV transmittance — clean water. Downstream of an RO you will be at or near it. On raw well or surface water you will not be, and capacity falls accordingly. If this is going in ahead of treatment rather than after it, send us your water report and we will size it properly.

Know your water before you buy

UV needs water it can see through. VIQUA specifies hardness under 7 grains (120 mg/L), iron under 0.3 mg/L and tannins under 0.1 mg/L. Past those the quartz sleeve fouls and output drops — you keep a green light and lose the disinfection. Deal with hardness and iron upstream.

Where it goes

Last. UV is the final piece of treatment in the line, after filtration, softening and RO. It kills what is in the water as it passes and leaves no residual, so anything downstream of the lamp can recontaminate.

Common to all Arros systems

100–240V 50/60 Hz, 1.5 A max, 125 PSI maximum operating pressure, 304 stainless chamber, LCD touchscreen controller (10.5″ × 5″ × 6.5″), combo 1″ MNPT / ¾″ FNPT ports, ambient water 36–104°F. Validated against cryptosporidium, giardia, E. coli and fecal coliform.

Lamps are consumables

Replace the VA22LU annually. A UV lamp does not fail cleanly — output decays long before it stops lighting, so a system that looks fine can be doing nothing. The Arros tracks true lamp running time and will tell you. We stock it.