Me have a outdoor filter and indoor filter. My concern is the direct sales guy from elken test my house water and the result similar to the following blog. Now I wonder does diamond, coway will it have the same result too?


Blog:
http://kynston.blogspot.com/2010/06/bio-pu...rification.html

My indoor filter look somthing like this:
http://www.m6.com.my/blog/wp-content/uploa...ater-filter.jpg