Check air purifier filter timing and the reminder reset steps

How can you tell when to replace the filter?

The LG Puricare 360 Alpha uses a filter-life (differential pressure) sensor to read how clogged the filter is and shows the remaining life at the top and bottom of the display. Red covers 0-30%, yellow 31-60% and blue 61-100%. LG gives about one year as the typical filter life and adds that it varies with environment and use.

The Samsung Mupung Cube 90 sqm goes by hours. Running 24 hours a day, a filter lasts six months to one year at most, and a replacement indicator lights when it reaches its rated hours. Samsung also says to replace a filter early if it is very dirty or smells, even before the indicator.

The table follows LG customer support (post dated 2026-05-20) and Samsung Service (dated 2025-03-10), checked on October 27, 2026. Even from the same maker, models can differ.

Can cleaning fix the reminder for some filters?

For the LG Puricare 360 Alpha, a low reading calls for cleaning before replacing. A clogged filter makes the sensor show less life, and cleaning can raise the reading. If the top or bottom still reads 10% or less in red after cleaning, replace it.

Samsung's instructions differ by filter. For any task, switch the unit off and unplug it first.

• Remove dust from the fine filter with a vacuum or soft brush. For heavy dirt you can wash it with neutral detergent, but rubbing it hard can damage it.
• Soak the filter saver (charged filter) in lukewarm water with neutral detergent for about 30 minutes, rinse it well under running water and dry it in the shade. If it is still damp, it can make a crackling noise.
• The dust-collection and charcoal deodorizing filters have no cleaning method, and washing can damage them, so treat them as replacement parts.

How do you reset the reminder after replacing?

Replacing the filter is not enough; the reset starts the next reminder period. On the LG Puricare 360 Alpha, tap the standby screen to reach the home screen, then go to Settings, Filter management and Reset filter. Select the filter you replaced and press Done.

On the Samsung Mupung Cube, press the filter reset button for 3 seconds after replacing. Its location and how you press it vary by model, so find it in the manual's diagram first. Menu names change with the model, so do not apply these steps as they are to another unit.

Where can you compare filter costs before buying?

In 2021 the Korea Consumer Agency tested eight air purifiers, and the yearly filter replacement cost of the cheapest and most expensive models differed by about a factor of two. Annual electricity cost also varied by model. The Seoul news report quoted its advice: check the standard usage area, look for the Korea Air Cleaning Association CA mark, and weigh the filter replacement interval and cost together.

That test covered 2021 products, so models on sale now may differ. On the product page, check the type, number and replacement interval of the filters, and match compatibility against the model name. Filter prices vary by seller, so look again just before buying.

Sources: LG Puricare 360 Alpha filter life guide, Samsung Service Mupung Cube 90 sqm care guide, Seoul news on the Korea Consumer Agency air purifier test. Checked October 27, 2026.