You need to mix the proper amount - 32 oz for 2 tsp or you can do 16 oz for 1 tsp - and be sure you measure correctly (8 fl oz = 1 cup). It needs to be the proper mixture or you may be absorbing the salt and not flushing your system, which can be very harmful because it will dehydrate you. Don't drink anything afterwards for at least an hour to an hour and a half to let the SWF (Salt-Water-Flush) do it's thing.
Also, the maximum amount of lemonade the Master-Cleanse recommends is 12 and you're drinking 15. Try drinking more water in between instead of more lemonades. I drank about 16 oz between each lemonade.