When filtering rain water or other un-treated water supplies, bacterial loading & contamination is a big issue that can affect the performance and lifespan of your filter cartridges. Silver Coconut Carbon, formally referred to as Bacteriostatic Coconut Carbon is the number one choice. The silver impregnated carbon media helps prevent bacteria from colonising within your carbon filter cartridge which may prematurely block your filters. This will not only create potential foul tastes & smells, but also cost hundreds of dollars more to replace cartridges too frequently. Our Pure BCC cartridges are designed specifically for tank water filtration to provide a longer life and also incorporate anti-bacterial properties to fight bacteria. The H1-9 Series of Whole House Filters are a Full-Sized Whole House Filter System that is able to keep up with peak demand flow rate from small to large households. The H1-9BCC system comes standard with a Washable sediment pre-filter for high capacity sediment filtration. This filter will ensure the 0.5uM Giardia rated BCC 4520-P5 cartridge will have maximum efficiency with a full cartridge life.