What is the water filter of Koṇāgamana? No matter how many different ways I search, I seem to get this exact/ALMOST exact phrase:"These relics include the staff of Kakusandha, the water filter of Koṇāgamana, a piece of the robe of Kassapa, and eight strands of hair from the ..." But I cannot find an explanation for it. This supposedly belonged to the "grandfather" Buddha to Gautama, aka Koṇāgamana (all according to https://en.wikipedia.org/wiki/List_of_the_named_Buddhas), and Siddhartha  supposedly lived in the 6th century BCE. If there are 1,000 Buddhas per kalpa and 4.32 billion years in a kalpa, that means they average 4.32 million years between appearances. So, what could this "water filter" possibly consist of? Thank you for your input.

To be specific, I am interested in the history and historicity of this artifact. For example, when was it first mentioned? From where did it originate? How did it come to Shewdagon Pagoda? Etc...
It is believed there are relicts from the previous Buddhas' in the Shwedagon Pagoda. This is possible that such artifacts survived since it is within the world cycle Maha Kalpa.

All monks should carry a water filter to filter out insets from the water. I would believe this will not be any different. It will be a basic piece of cloth.