[Aquaman]

Comparing these 2 systems is hardly comparing apples to apples. They are very different in a # of ways. The US-1500 uses standard "slimline" 10" x 2.5" cartridges, which are going to be available for the next millenium. The H-300 is a proprietary filter cartridge, and though there is no evidence that this system is going out of style anytime soon, it may eventually happen, and then finding filter cartridges could be an issue. The H-300 has a self contained cartridge, which is much easier to replace than the traditional housing and cartridge style system of the US-1500. The H-300 also uses KDF media in it's filter cartridge. KDF is an amazing filter media, far superior to carbon, but also much more expensive. There are no KDF filters available for the US-1500, however, the filters that are available will reduce a significant list of nasty contaminants that you don't want to drink, and will give you really great water. If money were no object, the H-300 is the better system, but for the $ the US-1500 is a great system. In the end, though, both systems fall far short of the ultimate in filtration, which is Reverse Osmosis.