i do not agree with your theory.
if you do not use a water filter,
your body ogans are take up that filter function,
see how terrible the old filter cartridge is when you replace it.
>> you try to make everything 'pure',
you can make something purer easily by filter only if it is certainly "not pure"
>>the more susceptible you become to other illnesses.
if you organs are overload with detox function,
your organs can no longer do other functions well
>>The water is a hell of a lot cleaner now days than years of old!
Exactly opposite ! The environmental pollution (include water) is much worse than my grandparents time. In future, it is harder to finder clean air, water and food