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I had the Silver Tellus and Posidon.
I connected the Ground Master to the a Rod which goes down 20 meters into the ground. I had someone come in to drill very deep. Here in Indonesia we use Ground Water which is filtered so another part of the garden was used just for grounding rods.
Puritan just worked allot more better for me in my room.
i think 1 meter is too short, you should prob be doing atleast 2-3 meters deep but this is a guess.
I am told by another electrical engineer the deeper the better but Puritan claims 1 meter should work fine. Iv never tried 1 meter but if it works fine it can save the hassle and cost of using longer copper Rods and the cost/expense of drilling.