This patented filter gel is used in ponds, marine and freshwater aquariums. Its special coherence enables bacteria to attach & multiply rapidly, reducing filter run-in time by 80%. Easy to use with various filter media, it stabilizes water quickly and extends filter life. It also reduces organic waste pollution & nitrates, & quickly revives biological filter in the event of heavy loads. Microbe-Lift Gel Filter is the first product to keep bacteria on filter material where it's applied. Dosage instructions: apply evenly on filter material, 15-30 min. before putting into filter. Repeat w/ every filter cleaning & when installing new filter media.