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Sartorius Nutrient Pad Sets have been used successfully in the membrane filter method for more than 20 years. The membrane filter method allows large sample volumes with low microbial count to be tested. Inhibitors, such as essential oils or disinfectants, can be rinsed out after filtration, before incubation.Practical and easy to handle, Nutrient Pads reduce labor and simplify many microbiological testing procedures. Microorganisms require the appropriate culture media for optimal growth.Nutrient Pad Sets are sterile, dehydrated culture media. Once they are moistened with 3.0 – 3.5 ml of sterile and demineralized (or destilled) water they are ready-to-use immediately. The level of moisture is optimal when an excess ring of water surrounding the NPS is visible.All Nutrient Pad Set types are supplied with the appropriate membrane filters, which are also individually, sterile packaged. The membrane filters tailored to meet the special requirements of microbial detection are available with 47 or 50 mm diameter. NPS are continuously enhanced as part of our development program to adapt our products to changing application requirements. Besides the new NPS types, we have also updated our packaging design. The standard NPS box contains 100 sterile Nutrient Pads, each of which is individually inserted in a petri dish and sterilized.