It looks like you want to categorize "effective" and "ineffective" methods for water treatment based on the provided options. Here's a categorization of the methods you've listed:
Effective:
- Microfiltration
- Distillation
- Reverse Osmosis
- Ultraviolet Radiation
All the methods listed above are generally considered effective water treatment techniques, each with its specific applications and effectiveness in removing different types of contaminants. If you have a specific criterion in mind for "effectiveness," please provide it, and I can help further!