Testing your unfiltered water as a control to your filter is a good idea, but also you're still bathing in that water. $400 seems quite high. There are much ch

Testing your unfiltered water as a control to your filter is a good idea, but also you're still bathing in that water. $400 seems quite high. There are much cheaper tests available, such as the National Testing Labs City Check test ($126 + return shipping) at https://www.purewaterproducts.com/watercheck/ https://www.purewaterproducts.com/watercheck/