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Doug Koehler

Doug Koehler

Geoprobe® Direct Image® Specialist

This problem is usually caused by one of two issues:

    1.  Soil build-up behind the HPT screen
    2.  HPT filter becoming plugged

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:

Call me at 785-202-1101 or email me, if you have questions.

Contact Us

1835 Wall Street
Salina, Kansas 67401
Phone: (785) 825-1842