been using the same set of phresh filters for 2 years no issues... prefilters must be washed in between grows to maintain your filter
What about if you are blowing through the filter rather than sucking through it? WIll that effect the life expectancy? I have a CanFilter66 for my 5x5 tent and it is under a year old. NEaring the end of my second crop with about a month break in between and I am starting to get the odd whiff. I have it outside my tent and and blowing through it.