Clear blockages in the drain quickly and safely with HG Drain and Plug Unblocker. This unique, safe, but extremely powerful unblocker offers many advantages. It does not have to be diluted, thus reducing the chance of splashing. The unblocker does not foam or splash when poured into the drain. Unlike other granular unblocking agents, it cannot make the blockage worse and does not harm plastic drain pipes. Note: Suitable for all types of drains (do not use on aluminium or zinc). Volume: 1000ml.