OPTIONAL EXTRA FILTERS (1 = $50) (2 = $80) (3 = $110) (4 = $130) 

This is for our newer bottle set that are B.P.A free,

If you are not sure if you have our older or newer bottle set, the difference is the size,

but even easier if your lid is white your have our NEWER B.P.A free 20 liter refillable bottle sets.

These also have the white float value, the older ones have a beige float value.