I went on a backpacking trip this week to test out some gear. I had issues with my Sawyer Squeeze having little to no flow. I used the squeeze last year and filtered maybe 5 gallons with it. After season, I back-flushed it multiple times before putting it away. When it came time to use it this year, it didn’t work at all until I forcefully backflushed multiple times, which restored just enough flow to keep us going. My buddy had a Sawyer mini as well and had nearly identical issues. Is this normal? Any ideas on restoring flow or what I may be doing wrong?