Class A is the NSF/ANSI 55 certification level for UV systems validated to deliver a 40 mJ/cm2 dose at their rated flow, the dose appropriate for disinfecting water with known or suspected microbiological contamination. The PRO30 was tested and certified by NSF International against CSA B483.1 and NSF/ANSI 55 for Disinfection Performance, Class A, at 30 GPM. Class B systems, by contrast, are certified at a 16 mJ/cm2 dose and are intended only for supplemental treatment of water already deemed microbiologically safe. If a lab has confirmed coliform or E. coli in your well, a Class A system is the appropriate tool.

Most homes do not need 30 GPM. A typical 3 to 5 bathroom home peaks around 10 to 14 GPM, which the Class A Viqua VH410 covers at a much lower price. The PRO20 handles 20 GPM at the same Class A dose. The PRO30 makes sense for estates and very large homes (roughly 7+ bathrooms), farms, and small businesses such as churches, restaurants, and offices on well water, where simultaneous demand genuinely exceeds 20 GPM. Sizing honestly matters in both directions: oversizing wastes money, and undersizing means water can outrun the certified dose at peak flow. Call us with your fixture count and we will size it with you.

UV needs clear, low-mineral water to work. VIQUA's water quality limits for the PRO series are hardness under 7 grains per gallon (120 mg/L), iron under 0.3 mg/L, and tannins under 0.1 mg/L, plus a 5-micron sediment pre-filter immediately ahead of the chamber. Above those limits, minerals coat the quartz sleeve and absorb UV light before it reaches the microorganisms, so the matching softener, iron filter, or tannin treatment must be installed upstream. UV always goes last in the treatment train. If you send us your water test we will lay out the full sequence.

No. UV is a disinfection stage, not a filter. It inactivates microorganisms (E. coli, fecal coliform, Cryptosporidium, Giardia, rotavirus) by scrambling their DNA as water passes the lamp, but it removes nothing from the water: no iron, no hardness, no sulfur odor, no sediment, no chemicals. Those problems each need their own dedicated equipment installed upstream of the UV. That is also why the pre-treatment limits exist: the PRO30 protects you from bacteria, and the upstream stages protect the PRO30.

The PRO30 pairs a UV intensity sensor (measuring the light actually reaching the water through the sleeve) with an integrated flow meter (measuring how fast water is moving past the lamp). The controller combines them into the actual dose being delivered right now, in mJ/cm2. A basic UV system with no sensor can fail silently: the lamp glows, but a fouled sleeve or weak lamp means the water is not getting a disinfecting dose. On the PRO30 you can see the number, watch it trend as the sleeve fouls, and clean or replace parts before protection degrades.

Three consumables: the amalgam UV lamp (part 602856) lasts up to 2 years and the controller counts down its remaining life with an audible reminder; the quartz sleeve (part 602976) gets cleaned when the intensity reading trends down and replaced every 2 to 3 years; and the upstream 5-micron sediment cartridge changes every 3 to 6 months. LightWise lamp dimming cuts sleeve fouling by up to 60% versus standard always-on UV systems, so cleanings are noticeably less frequent. The sleeve bolts release with a quarter twist by hand, no tools. We also recommend an annual coliform retest downstream of the UV as ground truth.

If the lamp fails or power is lost, water flowing through the chamber is not being disinfected. The PRO30 sounds an audible lamp failure alarm, and for unattended or commercial installations we recommend the optional plug-and-play solenoid valve (part 650627), which automatically stops water flow whenever UV performance falls below a safe level. The controller runs on 100-240V at 230W from a standard outlet, so a small backup power source can carry it through short outages if continuous supply matters for your application.

Yes. Confirm bacteria with a coliform and E. coli lab test before buying any UV system, and get the basic chemistry (hardness, iron, tannins, pH) at the same time so pre-treatment can be sized correctly. Bacteria are invisible, tasteless, and odorless; the lab result is the only evidence that matters, and the chemistry numbers determine whether the UV can actually do its job. Our well water test kit covers all of it, and we review every result personally. After installation, shock-chlorinate the plumbing and retest to confirm a clean baseline, then retest annually.