Water filter operation.

/ Water filter operation. #11  
I have two almost identical to the one you pictured. And yes - it is so difficult to turn on/off that I'm always afraid of breaking the handle off. The only improvement I've come up with was soaking it with WD40 - with synthetic additive. That seemed to have helped a good bit, but it sure didn't make it easy.

If you decide to go with the WD40 solution, if/when you get it turned off, soak it again and work in the WD40.
 

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