Candle filter for petroleum and pharmacy industries Wewin candle filter, also called filter tube or filter cylinder is a common type filter strainer, the stainless steel woven wire mesh and perforated metal welded in tube, cylinder and pipe shape to separate gas and liquid. And different layer number, different mesh size and different diameter thickness are required to ensure high accurate filtration fineness. Candle filter with perforated metal mesh has high bending and crimping resistance, which can provide rigidity and durability in applications. And they are mainly used in petroleum, pharmacy, chemical, water treatment and foodstuff industries.