Replace every 1-2 weeks or whenever it turns yellow.
Cotton Sediment Filter or White Pads (80 pcs.)
The cotton sediment pad filters rust, sand, silt, clay, algae and other particulates. It is the first stage of filtration in the multi-stage purification process of the Waters Bio Mineral Pot.
For you to visualize just how effective this cotton sediment filter is in removing particles, the pore size rating of Waters is approximately 20 microns. A micron is a millionth of a meter. A single hair strand measures 40 microns and paper about 100 microns.