I have a whole house water filter problem: every time I need to change the filter element I can't get the canister turned out of the top housing. I've broken 2 of the plastic wrenches, tried using 2 strap wrenches together and even made my own "wrench using wood and nylon rope. I contacted the manufacturer who recommended using food grade silicon grease on the threads and the O ring seal. I did that and was careful not to over tighten. It's time to change the filter and once again the canister housing the filter cartridge is jammed. Iím stumped and frustrated. Any ideas short of replacing the whole unit? I'm not adverse to that option, but donít want to end up with the same problem?