Product review (3 stars): LEAKS in my refrigerator ! ! !
I would be truly upset had I not been able to easily resolve the problem! I own a year 2000 CROSLEY refrigerator that requires a Whirlpool compatible water filter. A year ago I purchased a Tier1 filter that worked just fine. Although the recommended replacement interim is 6 months, the filter also stipulates "or 300 gallons." As we also use Britta pitchers, it takes us a whole year to run 300 gallons of water through the fridge filter. This new Tier1 filter has the exact same product number (RWF1022) but the day after installation I noticed a trail of droplets running down the outside of the door from just under the dispenser port tray. This led me to investigate more closely and I quickly discovered a steady (every 3 seconds) drip, drip, drip coming out of the dispenser port in the fridge door.

I uninstalled the filter (the water dispenser works without it but the water will be unfiltered) and the dripping immediately stopped. This confirmed my suspicion that it was not mere coincidence but in fact a related issue. I put the new filter side by side with the old one. There were negligible design differences: a slightly different label, modest connector design differences that did not interfere with installation, etc. But as I thought it through, one thing caught my eye despite being difficult to detect at first glance. THE TWO LITTLE BLACK RUBBER O-RING GASKETS AT THE TOP OF THE FILTER ARE SLIGHTLY THINNER THAN THE O-RINGS ON THE OLDER FILTER!

So I removed the filters from both items and put them side-by-side for a close visual comparison. Turns out the rubber O-rings didn't just APPEAR to be thinner... they actually ARE thinner by about one-hundredth of an inch! So I took the old pair of slightly thicker O-rings and fitted them in place on the new filter. This solved the problem. This is an unfortunate choice if it so happens the manufacturer is "cutting corners" to pad profits. Even if it's an honest mistake, it's still going to create problems for some of the consumers who purchase it. In this case, ME! But if it's happening to you and you no longer have your old filter handy to swap O-rings, take one of them off an hie thee to the hardware store where they are plenty cheap. Just be sure you purchase rings that are a tad thicker  NOT BIGGER IN DIAMETER, JUST A WEE BIT THICKER RUBBER WITH THE SAME RING DIAMETER. And here's a hint... If it feels as though they resist installation, a thin smear of petroleum jelly on each O-ring should solve that problem.