A blue filter housing in the basement can look reassuring even when
nobody knows when its cartridge was last changed. The same goes for a
softener or UV unit with an unread service sticker. I would first
identify what the equipment is meant to do, then make a simple calendar
for its parts.
Write down the model, cartridge or media specification, last change,
and location of its shutoffs or bypass. Follow the manufacturer’s
pressure-relief and replacement procedure; housings can remain
pressurized. Watch for drips after service and after the next few
cycles. A UV system may need lamp and sleeve maintenance on a schedule
that differs from a sediment filter. Salt level is only one part of
softener upkeep.
If a system was installed for a known water-quality issue, don’t
guess that water is safe because it passes through a filter. Use the
supplier’s report or appropriate testing and a qualified water-treatment
professional to confirm the treatment and service plan. A filter that
quickly clogs may indicate another condition upstream.
For a local treatment or plumbing contact, see Helpful
Resources. My Homeowner
Tools & Supplies page offers general household supplies, but
replacement media needs to match the certified system and its stated
purpose.