Viqua VT1 & VT4 Ultraviolet Water Purifiers Flow rate:3.5gpm The UVC light bulb helps

The UVC light bulb helps in sterilizing and killing yeasts

Ensure utmost safety when you replace the UVC light bulb with the Replacement  - UVC bulb for the OxyQuantum LED UV Air Purifier

as much as we might follow that advice

The TrojanUV 650139 Compatible Generic UV Light Bulb for Germicidal Water Treatment is a guaranteed replacement ultraviolet (UV) bulb that is a 4-pin step single-ended cell lamp

Viqua VT1 & VT4 Ultraviolet Water Purifiers Flow rate:3.5gpm The UVC light bulb helpsThe VIQUA VT1 and VT4 are compact point of use ultraviolet water treatment systems designed for single faucet applications in homes, cottages, and OEM installations. These economical under sink UV systems provide reliable chemical free disinfection for drinking water while fitting easily into tight installation spaces. Built with durable stainless steel chambers, specially designed UV lamps, and a compact power supply with visual status indication,