1. If your FROG @ease Test Strip shows a lighter color than the bottle label, one of two things may be happening.
First check to see if your SmartChlor Cartridge is empty. Remove the SmartChlor Cartridge from the system, drain all the water and shake to see if you hear any SmartChlor left inside.
2. If your cartridge is not empty, then check your water balance.
SmartChlor will not be effective if the pH and Total Alkalinity are not in the proper range. Make sure your pH is between 7.2 and 7.8 and your Total Alkalinity is between 80 and 120. Add water balancers if not.
3. Make sure your minerals are not older than 4 months.
You may still hear some spent minerals inside but after 4 months, the bacteria fighting mineral is used up. The FROG @ease Mineral Cartridge is often sold in a system kit.