Customer called in about beeping coming from water softener system. Moved forward with replacement of UV bulb. Isolated bulb. Removed connections. Installed per manufacturer specifications. Slowly turned water back on to system. Checked for leaks. No leaks found at this time. Performed inspection on out building. Flushed all toilets 3 times. Customer notified me that power to water heater was shut on and off because of a sulfur smell. Smell appeared to only be coming from hot side of fixtures. PSI to building was at 30 PSI. Performed flush and drain of water heater. Thank you for choosing CPI plumbing and heating!