LOL....none of these would benefit from the AquaDX. None. The unit cannot detect contaminants (particularly lead) at concentrations that mean anything useful. If your tapwater has 100 ppm lead (the lowest concentration the AquaDX can "see"), you must be connected to the local industrial plant effluent piping......cuz that level is 20 times higher than what defines haz waste.
Yazbeck is selling crap products, and he belongs in jail.