Dumb question

This water was boiled last night, rolling boil longer than 3 minutes. I noticed this stuff at the bottom of the pot. This can’t be drank can it? And would straining it and then putting it through a brita filter then make it safe to drink?

This water was boiled last night, rolling boil longer than 3 minutes. I noticed this stuff at the bottom of the pot. This can’t be drank can it? And would straining it and then putting it through a brita filter then make it safe to drink?