Used to use it but started to get expensive, used to buy it in 5ltr containers, now use just ordinary vinegar, was told to use it at the rate of 10ml mixed onto one kilo of food when I had YBS cleared it up in about 4 days, now I use it every day in the water except on a Sunday when I put it on the corn. Won every club old bird race last year so can,t be doing any harm.