What does filter housing wrench mean in practice?
The wrench helps loosen the filter bowl after the water has been shut off and the pressure has been completely released from the housing.
When does it matter?
Using it to tighten strongly may deform the seal, damage the filter bowl and make subsequent service more difficult.
Which solutions are related to it?
The housing is tightened by hand according to the instructions, and the wrench is mainly used to unscrew the supported housing.