Hi all.

I have upgraded my advanced GHL powered Reef system with the KH Director, to control my Ca Reactor.

First i must confess that... They did it again , yet another genius device, well developed and fabricated, as always. Thank you GHL.

Now, i like to ask if its expected that approx 10 cm of water remains at the end of the water sample tube, after a measurement is taken.

I have done precise calibration of dosing pump, and measurement of tube length.

The test results are spot on, no problem here

Best Regards. Tom