FWIW, I obtained a few upper chamber replacements from triquatics for about $10 each for my Hydor Koralia 1050's. The grill had broken, resulting in the dreaded random backward flow at times and loud clicking. The install was a breeze once I figured out to remember to put them on the same way (took off the first before noting this). Like brand new again! Quiet, blowing not sucking. Plus, I get to skip one round of cleaning that part!
