Sawyer S3 Select Filter - SP4321 - Foam Replacement
The Select systems reduce chemicals down to 0.5 parts per billion (up to 40 times lower than the EPA’s maximum recommended level) and reduce pesticides down to 0.01 parts per billion (400 times lower than the EPA’s maximum).
The Select S3 models go even further, purifying contaminated water from suspect sources:
Select S3 filters out 99.99% of viruses and reduces heavy metals such as lead, copper, arsenic, and mercury down to 0.5 parts per billion (up to 260 times lower than the EPA’s maximum).
Completely drying out the the Select Bottle is not necessary. The adsorption filtration technology within the foam is designed to both filter water as well as prevent growth. If you do dry it out and mold grows on the unprotected walls of the bottle, fill the bottle with water and continuously squeeze and release for approximately 3 minutes or until the mold is gone.
Select Foam System with Silicone Bottle and Reducer Cap