1/  Right bag size 

2/   Working temp no more higher than the bag material temp resist  

3/   The filter cage which support the bag must be suitable ( if the cage too big or too small,or surface not smooth, will scratch the bag and reduce the bag using life ). 

4/   The working condition should not have very strong acid and alkali inside and very wet .

5/    The Filtration velocity ≤1.3m/min

6/ The dust particle shape not very sharp

Normally we suggest the filter bag be change 18-24 months , but if the operating condition not very complicated and serious, the bag using life can be 48 months or more.