Generally, for mouthwash filtration, absolute rated glass fibre pleated cartridges (PPG) are used to give an excellent finish. Liquid is pumped at high pressure and temperature to avoid peppermint crystals forming in the filling lines, making stainless steel housings the preferred choice.
Toothpaste is filtered through stainless steel mesh cartridges prior to packaging because the fluid is extremely viscous and the filter cartridges are cleanable and reusable.