nevillet

Thanks again.

Many thanks for your reply. Does the cleaning mix ratio apply to both acids?

Hi, I repair various items including coffee makers and because of this I use various acids to remove limescale (calcium) deposits. For instance I use citric acid mixed with water and use a solution comprising of 1000ml of water and 50g of food grade citric acid - but this pure guesswork on my part. I am able to crudely measure the PH using Litmus paper indicator strips but would like to know how to make a solution of maximum concentration without wasting excess CA. I have the same question for some recently purchased sulphamic acid powder (99.9%) What ratio of SA to water? Is there a simple way of me calculating this in the future? Many thanks.