The small microbes that digest ammonia are nitrosomonas. But they emit a harmful substance called nitrous acid. Nitrous acid, in turn, is eaten by small microbes known as nitrobacters, turning it into a comparatively harmless substance, nitrate salt. This cleaning of water by microbes is the nitrification process, and the microbes that perform the process are the nitrifying bacteria. However, when nitrifying bacteria alone clean the water, and they multiply proliferously, they may suddenly die en masse, rapidly degenerating the water quality.

In the ecological chain of the natural world, large microbes eat these small microbes, and fish eat the large microbes, resulting in a natural selection cycle.

However, an aquarium is an artificial world, on a very small scale, making it extremely difficult to build a microbial world with a well-balanced ecological chain using filtering media, which significantly influences aquarium water. Thus until recently, it had been almost impossible to maintain good water quality over long periods of time.

This special structure is used not only on the outer surfaces, but inside as well, so that small microbes settle in the Power House ring's pores and large microbes settle in the holes, creating a microbial world with an ecological chain in the filtering media. In other words, each Power House ring can be considered a universe of microbes.

As a result, Power House products make it possible to maintain water quality over the long term and have gained recognition from professionals and enthusiasts, who favorably evaluate our products.