To be more specific about the filter, he said it was a basic charcoal filter that you can buy from any hardware store like Home Depot or Lowes.
It was small like the size of a small can of Vienna Sausage. It was white . He showed screwing the top off your shower head and inserting the filter just placing it inside nothing hard at all and then screwing the top back on.
He said that the chlorine in water dries our hair out and he has one in all his shower heads.
He also said that people wash their hair way too much and don't give the natural oils a chance to get to our hair.