I am trying to change the air filter on our vacuum cleaner every six bags. We have a lab and every six bags - although we try to wash our lab regularly with wheat cream shampoo - it seems his dandruff is pretty severe - every six bags (about 6 months) I have to change the air filter. You really can't go wrong with any 3M product, and replacing the filter and bag with fresh, clean 3M products seems to get rid of that fancy lab smell from the vacuum.
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