Hydro cannabis targeted in SA raids

More than 30 people have been charged after police investigating the manufacture and trade of hydroponic cannabis raided 60 South Australian properties.

The investigation, which began in May 2014 and centred on activities connected to four hydroponic businesses, culminated in raids over five days from March 24.

Police say 37 grow houses were searched, resulting in 31 arrests and the seizure of 711 cannabis plants, 26 kilograms of dried cannabis, two grams of amphetamine and two grams of cocaine.

Investigators also seized 33 firearms, $91,805 in cash, 12 vehicles and a large quantity of hydroponic equipment.

Assistant Commissioner Paul Dickson on Wednesday said the investigation was ongoing.

"This operation will certainly shake-up the hydroponics industry and disrupt any criminal activity being undertaken by those individuals," he said.