11/09/2026
GUESS & WIN: HOW MANY ARE INSIDE?
You know what an N21 filter cartridge does. But do you know what’s inside?
How many molecular sieve beads do you think are inside one NRC N21 filter cartridge?
Leave your best estimate in the comments. One guess per participant.
The three closest guesses will each receive one NRC N21 replacement filter cartridge.
The N21 (SKU 660) is compatible with the P21 filter system, reference 057679.
N21 filter cartridge, SKU 660
Competition closes: on Friday September 18th at midnight and the winners will be announce on Saturday 19th, in our stories.
In case of a tie, the winner will be selected at random.
NRC International will cover shipping to the winner’s delivery address. Any customs duties, import taxes or other local charges remain the responsibility of the recipient.
So, how many beads are inside?
Terms and conditions apply. This promotion is not sponsored, endorsed, administered by or associated with Meta.