When water is going to be drunk, the hose matters as much as the filter on the end of it. An ordinary garden hose is made from materials never intended for potable use, and water standing in one, particularly in the sun, picks up enough from the lining and the fittings to make the filter downstream a secondary concern.
What an ordinary hose contributes
Garden hose is manufactured for durability and flexibility rather than for contact with drinking water. Linings can leach plasticizers, brass fittings may contain lead, and antimicrobial treatments used to stop the hose growing mold are not intended for ingestion. Heat accelerates all of it, which is why the first water out of a hose that has been lying in the sun tastes distinctly of the hose. That first slug is the worst of it and should never go into a drinking container.
What a potable rated hose is
Drinking water safe hoses, usually sold for recreational vehicles and marine use and typically colored white or blue to distinguish them, use linings and fittings certified for potable contact. They cost noticeably more than a garden hose and they are the only correct choice where the water is for drinking, cooking, filling a tank or topping up an aquarium. The certification applies to the whole assembly, so a potable hose fitted with ordinary brass connectors is no longer a potable hose.
Where the filter fits into this
An inline cartridge on the hose handles sediment and, with carbon, chlorine and its taste, and there are units sold specifically for recreational vehicle drinking water combining both. It does not disinfect, so water from a doubtful source still needs treatment beyond the hose. Fit the filter at the tap end rather than the outlet where possible, so the hose downstream carries already filtered water, and remember that the filter cannot undo what the hose adds after it.
Storage, and the mistake that spoils it
Drain the hose after use rather than coiling it full, since standing water in a warm hose grows biofilm within days and puts it into your drinking water on the next use. Cap the ends so nothing gets into the bore in storage, keep it out of direct sun, and store it separately from the garden hose so the two are never confused. Sanitize it periodically with a dilute bleach solution and rinse thoroughly. Our whole house filter guide covers permanent installations where a hose is not involved at all.
Questions people ask about water filter hose
Can I drink from a garden hose with a filter on it?
Not safely. The hose lining and brass fittings contribute what the filter cannot remove afterwards. Use a potable rated hose.
How do I identify a potable hose?
They are sold for recreational vehicle and marine use, usually white or blue, with linings and fittings certified for drinking water contact.
Where should the filter go on the hose?
At the tap end where possible, so the hose downstream carries filtered water rather than adding to it after treatment.
How should a drinking hose be stored?
Drained rather than coiled full, capped at both ends, out of sunlight, and stored separately so it is never confused with a garden hose.