The H1-46CTO is a very versatile system suitable for a variety of situations where simple filtration is required and where no one specific, issue needs to be targeted. With the use of the 5uM gradient polypropylene spun sediment filter as the pre filter in the system, you are able to capture a greater amount of sediment within the cartridge. 100% virgin polypropylene material, the Purefer polypropylene filters are made using a unique single nozzle manufacturing process, where a single nozzle blows melted polypropylene onto a spinning 5uM filter core. As more polypropylene is blown, the filter diameter gradually widens and the outer density of the filter decreases.This unique manufacturing process gives Purefer filters a true gradient density that allows for a greater dirt holding capacity and higher filtration efficiency compared to standard melt blown filters made from multiple nozzle blowers, giving longer lasting better filtration. Following this is the 1uM Carbon Block post filter made from 100% coconut husk. These are exceptional chemical filters and with 20 years of experience and the technology behind the manufacturing of the PURE FCT carbon blocks these are the number one go to filter cartridge when it comes to carbon blocks. All PURE Carbon Blocks are registered as meeting the requirements of NSF/ANSI for Chlorine Taste and Odor, VOCs and THMs reduction. With the combination of these 2 filter cartridges these systems can be used as an extremely good all round filtration system giving both sediment and chemical reductions. Having the 5uM sediment filter followed by the 1uM carbon block we are able to maintain a good flow rate through the fiter system without comprimising the effectiveness of the filtration. These systems can be used on mains municiple water supplies, tank water, clean dam and creek water, and even good quality bore water. All this at an unbeleivable price makes these a great choice for those who are unsure and for any general purpose use.