Villeroy & Boch (old & new models(
Similar to SC771 with 28mm thread
Darlly
Darlly are on eof the biggest manufacturers of replacement filter cartridges in the world.
Darlly filters are made from Reemay material which is the highest quality spun bonded polyester material which doesn't fray, tear and is resistant to Chlorine, Bromine & Acid.