Amfix Universal Fixer - and reusing it

Hi, I recently bought a 1L bottle of Champion Amfix Universal Fixer (although it says B&W on the side also). Dilution (1+4) and temp range are on bottle but it came with no other info, and this is the best I can find in terms of a technical Datasheet?

I'm only planning to use it for B&W film processing - I typically use HP5 (But my understanding is it will work for just any film and for paper also)

My questions are:

1. Is this a reliable product and do other use - I got it because Ilford was out of stock at my local shop
2. Can't see on the datasheet any guidance on re-using once batched, how many rolls etc. The consensus seems to run clip test, check time and double. Once clip test time exceeds 60 seconds it's best to mix a new batch?

Thanks in advance