The 1/4 tsp of K-meta added to kit wines is in addition to the amount supplied with the kit. This is added for extendedaging since the sulfite level slowlyreduces over time and therefore the protection for the wine decreases. The amount of sulfite needed to protect your wine properly is directly related to the wine's pH. The lower the pH = less sulfite needed
You can roughly calculate the amount of sulfite in your fruit wine based on thetype and number of campden tablets added.