Silicone Grease
I agree that you must bleed the pressure from the filters before trying to open them up. If you install a "T" with a dump valve inside the loop that isolates the filters, you can dump the pressure in the filters without having to dump the pressure from the whole system.
I have Pex fittings at my place on the island. The first year, I had trouble with leaks when hooking up all of the plastic fittings in the spring. After I lubed up every fitting with silicone grease, I can put them on with ease and I have no leaks. I use it on any threaded plastic fittings in the system, (including the filter canisters) , and they all spin on and off without any cross threading or leaks.
Dan
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