water filter getting dried out---still good?

We use that filter, but we use the bottled water for cooking, dish washing, and drinking. After a trip, I stand it up in the sink strainer and let the water run out. After several days of air drying, I put the caps on it and store it in the camper for the next trip. Last year we used one the whole season. Ours is mainly used to filter out large debris that can harm the plumbing.