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The air impinges against the bottom of the cartridge and deploys in the immediate area. The pressure profile down the wall of the filter varies from negative(low) at the top to positive(high) at the bottom of the filter. The resulting burst of compressed air typically pressurizes the bottom third of the cartridge filter, resulting in only 10-30% actual cleaning effectiveness. Clean, dry, oil free compressed air between 90-110 psi required. The futher away the blowtube is located from the cartrid