- Econofltr PTFE 13mm 0.2um 1000/pk. Be the first to review this product. $616.00. SKU: . Overview. Specifications. Captiva Econofilter, polypropylene housing, PTFE membrane, 13 mm diameter, 0.2 µm pore size, 1000/pk. Aijiren high quality syringe filters that provide efficient filtration at a reasonable price.