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Frequently asked questions

Match your system's type number (1, 2, 4, 7, or 10) to the equivalent WLR lamp — check the label on your UV chamber if you're not sure which type you have.

Roughly every 9,000–12,000 hours, around once a year for typical continuous use — UV output drops before the lamp visibly fails, so don't wait for it to go out.

They're matched to different Aquada system sizes — WLR-1 fits Type 1 systems, WLR-2/4 fits Type 2 and 4 systems, and WLR-7/10 fits the larger Type 7 and 10 systems. Check your system's type number before ordering.

We'd recommend sticking with the matched lamp code, since UV output and fit are engineered to the specific chamber — check with us if you're unsure of an equivalent.

The lamp keeps lighting up but its UV output falls below the level needed for reliable disinfection, so water may no longer be properly treated even though the system looks like it's working.