After returning to the brewing scene after many years. I decided to start off using "Kit" beers to get my hand in. I have made several batches of various beer types all lower alcohol content and one of cider. All have very little carbonation evident after several days/weeks/months in the bottle. In my previous brews I would prime each bottle with 1 teaspoon of normal household sugar, brewed for many years and always had good carbonation. There are a couple of common denominators re the lower carbonation that I am trying to work out. I have used two different types of drops. One type has a package weight of 200 gms, contains 60 drops giving a weight per drop of 3.33gms. The second type has a package weight of 250gms containing 80 drops, giving a weight per drop of 3.13gms. One teaspoon of sugar weighs 5.69gms. Now, the manufacturers specification is for two carbonation drops in a 750ml bottle. When I bottled previously, I would use one teaspoon of sugar per 50ml bottle and had good carbonation, so there is a difference of only about 1 gm of sugar, yet I am getting much less carbonation from the drops. Any ideas why?