Soil build-up behind the HPT screen is easy to troubleshoot by removing the HPT screen. Does the line pressure return to normal, and are you able to pass the HPT Reference Test? If ‘Yes’, either clean or replace the HPT screen. If ‘No’, it’s time to clean or replace the HPT Filter. The detailed procedure for cleaning or replacing the HPT Filter, called “HPT Flow Module Filter Maintenance”, can be found on the Geoprobe® website at: www.geoprobe.com/hpt-technical-documents.
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