I have an IFLO 500 Filter Pump and small particles can now be seen coming back through the Inlet Vents, why?

It seems like the issue with small particles coming back through the inlet vents of your IFLO 500 Filter Pump is likely related to a media problem. There are a few possibilities: The media might be very coarse, which would prevent it from trapping small particles effectively. There may not be enough media in the filter, leading to inadequate filtration. Although less likely, the plumbing on the site could have been done incorrectly. You may want to inspect the media and plumbing to pinpoint the exact issue and make the necessary adjustments or replacements. If needed, consulting a professional might be a wise step to ensure the system is working correctly.