Charges over Sydney hydroponic house

Three people have been charged after an alleged hydroponic house was raided and 315 cannabis plants seized in southwest Sydney.

Police allege they smelled cannabis and heard extraction fans when a man answered the door of a Leumeah property and called out to other occupants on Tuesday.

A 65-year-old man and two women have been refused bail to appear at Campbelltown Local Court on Wednesday charged with producing a large commercial quantity of prohibited drug.