Patco Granular Drain Cleaner cleans drains with ease and removes sewer line obstructions. Regular use of Patco Granular Drain Cleaner prevents slow drains, clogs and build ups. Starts to work on contact and removes even the toughest clogs. This product contains a non-acid formula which will not harm metal or plastic pipes and septic systems. Excellent for deodorising and eliminating drain odours.