You didn't say how big your pool is, but adding 1/2 to 1 gallon each night isn't necessarily all that much. I have a 24 ft AG and cya around 40 and I add 2-3 qts. per evening on most days. With a cya of 90, you're gonna have to add enough bleach to get the cl where you need it or you're gonna have a green pool to deal with.