Slow running sinks are caused by a build up of debris down your plughole. If it is not cleared in time it can lead to a full blockage. In kitchens the build up is food particles and grease, in bathrooms it is hair and soap sludge. You need different product formulations to tackle these different products. Bathroom blockages should be treated with Bathroom Plughole Unblocker. To blast kitchen blockages use Kitchen Plughole Unblocker. Regular use of these products will keep build up at bay and prevent costly plumber call outs.