Why Calibration Fluid is Not Included in CoralVue ABC Reagent

Recent data suggests that using calibration solution on an automatic water testing system can add unnecessary inaccuracies to test results. Moreover, if the tank values do not match the calibration solution values, the automated testing system will perform additional and wasteful tests following the calibration procedure. As a result of these findings, CoralVue has opted not to include a Calibration Solution in their ABC Reagent.

What is a Calibration Solution?

Calibration solution is a stabilized saltwater that undergoes testing through various methods to determine its values. However, the alkalinity of the solution is not fixed and undergoes equilibria phenomena upon opening. This results in a value change due to exposure to different atmospheric conditions between bottling and re-opening in a new environment. Manufacturers have taken various measures to counteract this phenomenon, but it cannot be completely eliminated. On the other hand, the Calcium and Magnesium components of the solution remain stable unless evaporation occurs.

Alternative Option

Leaving the sample lines in the tank is a simpler alternative than transferring them to a calibration bottle. This is because the latter may lead to compromised flow, air gaps, and incomplete priming of the lines. These issues can cause problems during the calibration process.

Most customers prefer to manually test their tank water with test kits they trust for accuracy. Consequently, they know the values in their tanks or have an idea of acceptable accuracy. Using tank water as a "calibration solution" is much more accurate than relying on any calibration solution. This is because the alkalinity of tank water is more stable than a small volume of calibration solution. Therefore, once tank water is tested, there is minimal chance of it changing before and during the calibration process, except for active dosing.