ceramic laundry discs

How do they or do they work?
Are they worth the money,$29.85 for three of them?
The ad says that they are good for up to 700 washes.
How do you use them?

They don’t work, from everything I’ve heard. Cecil also weighed in:

Do “laundry balls” that supposedly replace detergent really work?

Those ceramic balls don’t do anything, but I’ve heard throwing a magnet into your laundry will work wonders. And a crystal works better than a magnet…

How about a magnetic crystal ball? With ceramic trim?