Yes, filter socks can be reused, and should be rinsed VERY frequently (IMO at least every couple of days). Consider their purpose - they are a mechanical filter to trap waste/food etc. Once there it rots until you clean it. Even if it doesn't seem that there is much back up of water, I would still rinse them. They can be washed, but don't use soap. I used to use a mild bleach solution but mostly I used a garden hose with a strong sprayer attached.