in the store i work at we get this all the time. just do a water change and modify the current dosing regement( if you are dosing, for example: if Calcium demand is higher than alk demand keep dosing Calcium but do a lesser dose of alk. here are examples of what im talking about in numerical values: 30mls of Ca 20mls of alk component) or dial the calcium reactor down. If he or she is doing something else regarding to methods of dosing, please, tell us so we can further assist you. Mentioning what brand of 2 part or 3 part or even homade solution will help us further assist you in order to give you the most accurate answer