InVade Bio Drain combines citrus oil and premium microbes in formulation thick enough to coat the insides of drains, allowing it to eliminate odors and eat through scum. When first using InVade Bio Drain apply every other day for the first week and then continue to use once a week afterwards. InVade Bio Drain can also be used with a sprayer or in a mopping solution. The citrus oil has a great scent and provides extra cleaning power.