Keep the first record
Retain the original readings, dashboard and report so the starting point remains available.
After heating work
Should I re-test my heating system after cleaning?
Re-testing can provide comparison evidence by recording water checks after work and comparing them with an earlier assessment. It can help you discuss what changed and what may need monitoring.
A useful comparison sequence
Allow for the agreed work
Follow the contractor, product and manufacturer instructions about commissioning, treatment and the appropriate time to check again.
Record the follow-up
Use the same guided Assessment process and compare the recorded turbidity, inhibitor and pH information in context.
What re-testing does not prove
A difference between recorded checks does not by itself prove what caused the change, guarantee improvement, certify workmanship or show that the whole system is safe, defect-free or compliant. Unexpected results should be discussed with the person responsible for the work or another suitably qualified professional.
The Twin Re-test Pack contains two further Assessments for separate points in time. Use each unique journey in accordance with its instructions.