Skimmers exploit whats known as foam refractioning, dirt (nutrients) are suspended in saltwater, and being as to how sw
is bi-polar in nature, when the sw
is exposed to oxygen bubbles, the suspended nutrients cling to the bubbles. They they travel up the cylinder until thw bubble pops, in turn leaving the dirt at the top.
youll prob come across a ton of cheapie junk skimmers that look just like the higher-priced counterparts, but do yourself a favor and spend good money on a high-quality skimmer. You will be amazed at the performance