|Cause||Immediate Corrective Action||Preventive Follow-up|
|Filter needs to be backwashed||Backwash the filter according to the manufacturer's instructions.||Adjust pH to 7.2 before adding Sustain Shield Energizer Tablets.*|
|High pH and/or TA||Adjust pH and TA to proper levels.|
*Note: Filter pressure may increase with the addition of Sustain ¾-inch Shield Energizer Tablets. To avoid this, adjust your pH to 7.2 before adding tablets to your skimmer. Do not backwash immediately after adding Sustain Shield Energizer Tablets.