Hose filters fail for mechanical reasons far more often than they fail at filtering, and almost all of those failures come from three things: where the filter was placed on the line, what was holding it up, and what happened to it in November. None of them is complicated and all three are routinely got wrong.
Where on the line it belongs
At the tap end rather than the outlet end, so the hose downstream carries already filtered water instead of contributing to it after treatment. That matters most when the water is going anywhere sensitive, since a hose adds material from its lining and its fittings. It also puts the filter somewhere you can see it, which is what makes anyone remember to check or change it. A filter buried at the far end of a coiled hose is a filter nobody services.
Supporting it properly
A full housing is heavy, and a charged hose pulling on it applies real leverage to whatever holds it. Hanging a filter directly on the tap thread works the connection loose over a season and eventually cracks the tap or the fitting. Fit a short flexible whip between the tap and the filter to take that strain out, and stand or bracket the housing on the ground or a wall. Both measures cost very little and prevent the most common physical failure.
Threads and adapters
Hose thread and pipe thread are different standards, so a housing intended for plumbing needs adapters at both ends to meet a hose, and buying the housing without checking this is a familiar frustration. Fit a washer at every hose connection and check it, since a hardened or missing washer is the most common source of a weep. Use the flow arrow on the housing, since a sediment cartridge fitted backwards filters from the wrong side and blinds quickly.
Winter, which decides whether it survives
An outdoor housing full of water splits when it freezes, and the failure happens quietly in November and reveals itself on the thaw. Drain the housing when the outside tap is shut down for the season, and store the cartridge out of it rather than leaving a wet one in place, since a wet cartridge in a shed grows biofilm all winter and puts it straight into your irrigation in spring. Our inline filter guide covers cartridge selection by duty.
Questions people ask about inline filter for garden hose
Should the filter go at the tap or the hose end?
The tap end, so the hose downstream carries filtered water and the filter is somewhere you will actually see and service it.
Can I hang it off the tap?
Not safely. The weight and hose leverage work the connection loose. Use a short flexible whip and support the housing.
Why will my housing not connect to the hose?
Hose thread and pipe thread are different standards. A plumbing housing needs adapters at both ends.
What should I do before winter?
Drain the housing, remove the cartridge and store both dry. A housing left full of water splits when it freezes.