I see no words in the item description that indicate the quantity as plural, is this a 3 pack or a single?

Watch the video. The machine uses 3 filters at the same time, so it's a 3 pack, that provides a single change of all 3 filters in the machine. The recommendation is one of these 3 packs every 6 months for a complete filter change.

Is this the standard filter used in HepaSilent model for Blueair 500/600 Series Air Purifiers?

Yes. BlueAir only produces one set of 3 filters for the 500/600 series. If you go to their website, www.blueair.com you can read about their HEPASilent Technology. The old original blueair filters used to also have an activated charcoal layer as part of the standard filter. They have done away with that extra layer. If you want to filter cigarette smoke they have another smoke filter series called SmokeStop. The original SmokeStop filters had some extra type of ingredients to filter out VOCs etc. The new non SmokeStop filters don't have the activated charcoal layer so it doesn't filter out any VOCs at all. The old ones used to be able to filter out fumes from new carpet out gassing etc, but not the new ones. Older was better. Just another way to make more money now, ha,ha. We have no choice but to purchase what they offer. Anyone at BlueAir listening?

my Blue air 501 machine takes 3 filters. Is this only 1 filter or the 3 that it needs?

It was a little confusing at first, but the full read to RECOMMENDED to change filter once every 6 months, or dependent on usage. This filter can be recycled after it's changed. The 500/600 Series air purifiers use 3 separate filters, this replacement pack contains a set of 3 filters." It says that it contains the pack / the set of three. These are the dual protection filters. I use the regular ones that are around $79.

Hi, can these be used in the Blueair 680i model? Thanks!

Blueair 500/600 series models should all use the same size filter. If you read the description, it said compatible with 680i.

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Description

♻️ Elevate your air game—breathe cleaner, live smarter!

ENERGY SMART AIRFLOW - Low-density filter design reduces air resistance, saving energy while maximizing purification.
EFFORTLESS FILTER SWAP - Designed for quick, hassle-free replacement to keep your air fresh without downtime.
BREATHE PURE LIVE BETTER - HEPASilent tech removes pollen, dust, pet dander, mold, bacteria & viruses with 99.97% efficiency.
ECO FRIENDLY ANTIBACTERIAL - Made from naturally antibacterial, fully recyclable polypropylene and polyethylene fibers.
CLOG RESISTANT GRADIENT STRUCTURE - Advanced fiber layering resists clogging even under heavy particle load—maintains peak airflow.

The Blueair Genuine Classic 500/600 Series Replacement Particle Filter uses cutting-edge HEPASilent technology to remove up to 99.97% of airborne pollutants including pollen, dust, pet dander, mold spores, bacteria, and viruses. Its clog-resistant gradient structure ensures consistent airflow and filtration efficiency, while the 100% recyclable, antibacterial materials promote sustainability and health. Compatible with multiple Blueair Classic models, this energy-saving filter is easy to replace, making it the essential upgrade for a cleaner, healthier home environment.

Specifications

Brand	BLUEAIR
Model Number	500600 PFK
Colour	White
Product Dimensions	22.86 x 7.62 x 33.02 cm; 453.59 g
Material	100 Percent Recyclable, Polypropylene and amp; Polyethylene Fibers
Compatible Models	Blueair classic 501, 503, 505, 510, 550e, 555eb, 601, 603, 605, 650e
Special Features	The gradient structure of Blueair filters traps particles of all sizes while maintaining maximum airflow. It resists clogging and won't re-release particles back into the air, even when the filter is heavily loaded. Blueair filter media is ultrasonically bonded to prevent filter fibers and other particles from being added back into your environment.
Item Weight	454 g

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