Andrew 2011 February 1 by Blue Northern I agree with previous comments - there should be no need to add anything other than flour and water.Once I have used some starter for baking (usually about 300 grammes for 2 x 1kilo loaves) I will keep a further 200 grammes of the old starter and throw the rest away (yes, it feels extravagant but otherwise your starter will just get bigger and bigger).