Of course I know all this. I just can't find a water sample lab in the Philippines other than government ones that won't accept samples from private individuals (sigh).
As for zeolites I've only ever thought of them for their drying effect. Was going to look into them more properly when I start turning sugar-->alcohol-->distill-->zeolite-->vehicle fuel.
I've never considered them for water purification before. Look forward to reading your post.