I went to a hydralic specialist shop they manage to twisted them a part
Even they have to youse
heat on it and tapped on it whit a
hammer normal size but they tapped quite hard on it
Filter cardrige was placed in a special bench and a big pipe plier modell very big and that weren´t enugh the put a 3 m long metall bar on it
In the end it was tow gyes on it and one gye on working bench to pull it
down, even a sledge ("big") hammer comme in use
Talk about stucked catridge
One off the catridge element was stucked so much that even they had to give it upp
Filter elemen hade imploded so you can imagin howe plugd the element were
They recommended me to change filter more frekvently....