Summary Shampoos that we use everyday had a lot of toxin in them. Those toxins released into the water and messed up waterway. Fungicide in medicinal shampoos would kill many organisms, from tiny algae to big plants and fish.
Reflection - Honestly, everyday I wash my hair with dandruff shampoos. Those shampoos smell real good because industrial facilities remove a lot of stinky stuff.
And now fungicide gets repeated day after day after day. The algae just die, but bigger plants suffer retarded growth. Animals like fish are affected too. We might want to start coming up with ways to get our dandruff shampoo, and other personal care products out of the drink.