Metsorb HMRP adsorbent is a free-flowing powder designed for incorporation into pressed or extruded carbon blocks. The addition of HMRP at relatively low levels to a carbon block design is very effective for the reduction of lead, and at higher HMRP usage levels effective for reduction of arsenic, meeting the requirements of NSF Standard 42. HMRP utilizes a patented material to adsorb not only cationic lead species, but also both forms of arsenic: arsenic III and arsenic V, present as (neutral) arsenite and (anionic) arsenate, respectively. HMRP will also reduce a wide range of other metal contaminants commonly present in drinking water or process water and is effective in polishing low levels of metal contaminants from industrial waste streams.
Recommended METSORB HMRP Use
As a fine powder, the addition of HMRP is recommended as a component of pressed or extruded carbon blocks, where heavy metal reduction is desired. In blending HMRP with carbon and poly binder components, one must assure that both the starting mechanical blend and the unfinished block produced appear homogeneous. The following guidance is provided as a starting point. The performance of each specific design should be evaluated by qualified laboratories for reduction of the specific contaminant in question using industry - standard methodologies.
Design Parameters for Improved Performance
A nominal 10 - inch carbon block, standard for most counter top and under counter applications, will provide more overall volume and more functional media than the 2 to 2.5 inch blocks typically used in end - of - tap (EOT) applications. For example, a nominal 10 - inch carbon block can readily provide contaminant reduction for 1000 gallons or more of water, while the smaller EOT blocks are rated at several hundred gallons.
The larger block design also gives longer contact times (EBCT or empty bed contact time) for better contaminant reduction. For example, a nominal 10 - inch block will provide an EBCT of 10 -15 seconds, while a typical 2.5 inch EOT block gives only 3 seconds EBCT.