UV Sterilizer (Aqua Ultraviolet Classic)
Aqua Ultraviolet
An in-line ultraviolet sterilizer: water flows past a UV lamp in a sealed chamber, and exposure dose — set by wattage and flow rate — kills free-floating algae, bacteria, and parasite stages without chemicals or residues.
Why it mattered
UV sterilization gave reef keeping a physical answer to problems chemistry handled badly: green water, bacterial blooms, and the free-swimming stage of parasites like ich. Nothing is added to the water and nothing lingers in it.
Aqua Ultraviolet, founded by Ron James in California and building UV systems for roughly four decades, became the hobby's reference maker — the first UV company to win EPA approval for its products, with units sized from small aquariums to public-aquarium scale.
The sizing conversation is the technology's real legacy. The same unit clarifies water at high flow or sterilizes at low flow, so keepers learned to shop by dose rather than by tank size alone — a piece of engineering thinking UV brought into everyday reef planning.
Key specs
- Classic line spans 8W to 114W and beyond (Viper series to 400W)
- Flow rate sets the dose: fast for clarity, slow for sterilization
- No chemical residue; does not affect biological filtration
- Quartz sleeve protects the lamp and needs periodic cleaning
- Units serve aquariums, ponds, and commercial systems
Keeper notes
- Keepers run UV for water clarity most of all, and rate parasite control as a supporting benefit rather than a cure.
- Undersizing is the classic mistake — a unit matched to clarity flow rates will not deliver sterilization doses.
- Bulb output fades with age long before the lamp visibly fails, so replacement runs on a calendar, not on burnout.