众所周知，要想养鱼必须常换水，不仅费时费力，而且浪费大量的自来水。近几年，市场上出现了各种各样的水族箱，但由于价格较高，养鱼的品种也很有限，使大批养鱼爱好者重而却步。北京陆歆公司经过三年的观察研究，在缸养鱼半年到一年不换水上做了多次的试验，终于在1996年获 As we all know, in order to fish, we must constantly change the water, not only time-consuming and laborious but also waste a lot of tap water. In recent years there have been a variety of aquariums on the market, but due to the higher prices, the variety of fish farming is also limited, leaving a large number of fish-lovers reluctant. Beijing Lu Xin company after three years of observational studies, in the cylinder of fish six months to a year to do a lot of water on the test done, and finally in 1996