Millipore groundwater sampling capsule filters provide an EPA-accepted method for collecting groundwater prior to dissolved metals analysis. These filtering capsules meet requirements for USEPA Method 3005. A certificate included with each capsule shows lowest detectable level (LDL) analyses for 67 metals and 2 anions. The low-extractables, polyethersulfone membrane filter and housing materials minimize background during sample analysis. 0.45µm capsule filters are designed for relatively clean water with minimal particulates. Capsule filters provide four times more filter area than 142mm disc filters for faster flow rates and higher throughput. Ready to use. No assembly required.