Quick thinking by firefighters saved a juice factory worth $4.5 million at Monarto South on Friday.
Eight Country Fire Service (CFS) and five Metropolitan Fire Service (MFS) trucks rushed to Joint Venture Juicing on Arbon Court after an alarm went off at 3.10pm.
They arrived to find pallets, packaging and the south-western wall of the factory on fire, and smoke pouring out.
The fire threatened to spread further into the building through a refrigeration unit, but firefighters were able to stop its progress.
About $160,000 worth of damage was done, but the business was expected to open again today.
Investigators were unsure of the cause of the fire on Friday night.
Firefighters also attended two house fires earlier in the week.
A house on Kulde Road at Tailem Bend was destroyed by fire on Wednesday.
Both the CFS and MFS responded to 000 calls and were able to protect surrounding houses, but the fibro dwelling and a carport could not be saved.
The buildings were estimated to have been worth $150,000.
That evening, a home at Mount Pleasant was also destroyed by fire.
About 40 firefighters from nine units fought a fire on Angas Valley Road from 5.45pm.
Two people were taken to hospital after the fire, which started in a shed and spread to the house and a car, destroying them all at a cost of about $150,000.
Anyone with information about any of the fires should call Crime Stoppers on 1800 333 000 or visit www.crimestopperssa.com.au.