filters

I have a res med s9. According to everything that i have seen or read on filters, new ones last up to 2 weeks. When i replace old filters with new, they only last for 3-4 days before i start sneezing, runny nose, which last most of the day, symptoms like allergies. I clean my air tube and mask weekly. I wash the old filter, and air tube with dawn, and use the filter for a few times, so it will last for 2 weeks, and the allergy symptoms disappear. I haven't seen anything on any forums about this issue. Looking for some advice, and or input. Thanks

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