Update.
So I’ve emailed the boss with our concerns. He’s left me a voice message explaining he is really disappointed and that he’ll send another team round to rip out what has been done and replace.
My issue is, I’m concerned about this company coming round due to issue above. Plus as mentioned above and by two other specialists that their solution is incorrect and we should be considering a slurry mix instead of the membrane.
Any help would be welcomed.