Biodegradability
How long does a filter remain in our eco-system until it degrades? Does a filter degrade at all?
Toxicity
How toxic is a filter if it gets into the water?
How toxic is a filter if it remains in the soil?
Bioaccumulation
Does a filter accumulate in organisms and is there any suspicion of it having an endocrine disrupting effect?
[6] https://www.carecreations.basf.com/ecosun-pass and www.ultrasun.com