even I had joined the testing on Monday, I get confused what you mentioned TL4 (1-4).
Do we have so many different samples? @sukit
Total 5 kinds! Sorry if I missed something.
What I know the most update modified one having this characteristics.
1. No surfactant.
2. More concentrated chelating agent.
3. Contain MB ( inhibitor ).
We got the photo which @sukit sent us, it looks better than before.