These are common and not from a specific vendor.
These fit all alkaline water flask
Change of filters is determined by pH strips. When the pH of the water goes below 7.5 change the filter
The filters are mannufactured in Asia and all sellers buy from that market

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 2.7 inch
Height : 1.4 inch
Length : 4.5 inch

Item Weight: 0 ounce (View shipping rates and policies)
Shipping Weight: 0.32 ounce (View shipping rates and policies)

ASIN : B005FDHN02