When should core samples be collected from filters using granular activated carbon?

Granular activated carbon (GAC) filters are essential for removing impurities from water, and the integrity of these filters needs to be monitored regularly to ensure their effectiveness. Collecting core samples at the time of installation provides a baseline for the filter's condition. However, regular sampling every six months thereafter allows operators to assess the performance of the GAC. This timeline aligns with typical maintenance schedules, providing sufficient data to identify any changes in the filter's performance due to adsorption capacity, channeling, or breakthrough of contaminants.

Sampling every six months is a standard practice in the water treatment industry. It strikes a balance between ensuring water quality and not overburdening the operational schedule with excessive sampling. It also allows for timely adjustments or replacements of the GAC if issues are detected, safeguarding the overall treatment process.

Sampling at installation only, or at other less frequent intervals like monthly or yearly, could either lead to unnecessary operational demands or result in delays in addressing potential issues with the filter's performance. Regular checks are important, but they need to be pragmatically scheduled to maintain both efficiency and efficacy.