How Many Types of Water Is There After Tap Water?

There are many types of filtered water after PUB tap water from the mains. This is due that water from the tap is filtered and cleaned from general filtration systems, there are trace elements and unwanted chemicals that are dissolved in the water which is not suitable for Scientific, Industrial or Production uses. 

Scientific - Labs, R&D Facilities, Hospitals and Schools / Education.

Industrial - Engineering, Power Stations, Steam Generation, Cooling Systems.

Production - Medical, Pharmaceuticals, Semi-Conductors / Electronics, Oil & Gas, Marine...the list goes on.

So then, how many types of filtered water are there? 

In order of Purity, here is the list :

1. Distilled Water
2. Deionized Water
3. Ionized Water - Namely Alkaline / Acidic Water
4. Reversed Osmosis Water
5. Ultra-Pure Water

I shall post one by one the difference in per water quality for all to understand what is this water differs from the next.