BTW on those Chem-Strips ?
I got them so long ago, ( and know bit about test strips )
I got them from the company , probably.
As the battle between Cheap and Frugal will always continue ...
I bought two containers , 50 strips / container.
much much cheaper on the shipping and they were less than priced these days.
Ive used 5 strips out of container # 1
just to be sure on the Brita and my Espresso machine
my tap water has not changed. the readings out of the Brita have not changed
but I checked 5 times
I no longer bother.
and have not for quite some time.