Thick Absorbent Pad, 34 mm from Merck KGaA is a cellulose support pad for reinforcing filters in Millipore's monitors for contamination analysis. It can avoid membrane damage during high pressure or fast flow conditions. It also enable you to combine multiple stages of filtration into a single process step, saving time. When saturated with growth medium, they can also be used for culturing microorganisms on membranes.