Redchequen, Yes you are right, I use 35ml on a 3.5 lts drinker and I get like 4.0 on PH...I normally add 150ml of Enviroboost to 1lt of apple cider vinegar and that is what I use in the drinking water. I think that the worst thing are the carriers, those pigeon that look great but they are salmonella carriers... Anyway...Vive la Salmonella!!!! that is a neighbor problem, not mine...all my pigeons look great!!!, hmmmm I have three pigeons that I am sure they have salmonella, one died yesterday, a very good stock bird...the other two, their feces are green, pallid green, they have lost weight, one of them has one foot like bumble foot, hardly can put weight on it, I have injected them with .3ml of enrofloxacine (baytril) for one week, every day...they were exactly in the same situation not going worst not improving, since two days ago I decided to give them only trimethoprim , one quarter of a tablet per day, they both look a little better, its hard to find such a medication, Mercasystem has a product that has it, Antimicina. I insist, the best way is to prevent it, disinfect, clean (dont take me wrong, my loft has easy bed on it, I change the top every week, and I spray on top a solution with F10 diluted). The utilization of products like the Salgar or similar, I think will do the job. Salgar (I just read about his product) kills the salmonella in 95% in 24 hours, it only works on the guts of the bird and in the environment, its not absorbed to the blood stream which means it wont kill the bacteria once is establish in other organs or on the blood stream and promotes the good bacteria, much like a probiotic with the peculiarity that effectively kills gram negative bacteria like the salmonella. Its a daily product, using it everyday you assure that no salmonella will be established in your flock and will promote good health in the pigeons. The recommended doses is 2 gr per kg of food, which means one kg of this product will do 500kg of corn, the bad news is that the smallest presentation is 25 kg (12500 kgs of corn), two years of product. I would love to hear any other ideas or methods on how to deal with Salmonella....that will help me and other fanciers...I am quite sure there is a lot of experience in this forum... I have been in Scotland for 4 years now, I have seen and handled a lot of very nice pigeons and every year I have seen a lot of losses, my guess is that not all the birds are healthy and poor health is one of the main reasons of the quantity of looses and not the quality of the birds. People spend enormous amounts of money acquiring excellent wining blood, and still the looses are quite high, are the birds rubbish?, I dont think so, but the handling I think its not at the same level as the quality of the birds.