Introduction on double cyclone system With two excellent special-designed dust tank enabling excellent double cyclone cleaning.The dust goes into the first dust bank for the 1st cyclonic cleaning,at this stage,about 95%-98% of the dust will be removed and stay at this dust tank.Then the rest(about 2%-5%) of dusts go into the 2nd dust for the 2nd cyclonic cleaning,at this stage,about 99.9% of the dusts will be cleaned.There is no Hepa filter in the first dust tank and in the 2nd dust tank there is a very big Hepa filter.Our double-cyclonic system makes the great part of the dusts always far away from the Hepa filter,so the Hepa filter can keep clean and functional for a very long time.Then the suction power of our vacuum cleaner can keep always strong and the filters can be used for a long time. Advantage of our double cylcone system vacuum cleaner: 1)Keep almost same suction power from the beginning to the end; 2)With two cyclone tank for a higest cleaning efficiency; 3)With 2 Hepa filters for thoroughly clean:One in the 2nd dust tank and the other at the air outlet; 4)Long-time use of Hepa filter,not necessary to clean or replace the Hepa filter often for one year; Features: 1.Super big power upto 2200w Max; 2.Big dust bin cpacity of 5L; 3.At least 1 year-no need to clean or replace the filter; 4.Twin washable big Hepa filter; 5.Double-cyclone system; 6.6 filters system; 7.Electric speed control; 8.Cord retractable automaticaly; 9.Blowing function; 10.Air turbo brush and remote control optional