The test sample worked well.

I found that the “filter” (a lady’s nylon sock) impedes the function of the pump and causes waterflow to be unreliable.
I made my own filter out of fine mesh used for filtering fuel.
for the frame I used a piece of plastic pipe (large enough to place the pump inside), drilled large holes around it and wrapped the mesh around it.
This cured the uneven waterflow.
First impression after using the test concentrates supplied is that it is well worth the investment and will be profitable fun to use.
Upon first recieving the DF, i found it had a motor problem. As you can imagine, the warrantee means nothing in Oz, return postage for repair is as much as the unit.
Customer service was awesome. I was immediately sent a replacement motor unit at no cost. This is above and beyond the limitations of the warrantee.
Camel mining are trustworthy and the DF is worth purchasing.