I called Doulton HK office. Here are some points I got from them
1. Ultracrab, which have M12 and M15 type.
2. Ultracrab have NSF 42 and 53 certification (can find in NSF website)
3. Last few months, they released Bio Tech Ultra (replace Ultracrab M12 type) and HP Ultra (replace Ultracrab M15 type).
4. They are upgrade from Ultracrab version but still not yet get NSF certification.
5. The promotion counter outside are all now only selling Bio Tech Ultra and HP Ultra now.
6. Bio Tech Ultra and HP Ultra can reduce lead base on their own test result
Here is the comparison in between Ultracrab, Bio Tech Ultra & HP Ultra. It show Lead reduction PH8.5 result is from Internally generated test data only.
That’s all my understanding. For questions, I think it is better to call to Doulton HK office. For Ultracrab, seems now still can order from Doulton eshop and once stock sold up, they will only selling Biotech Ultra.