I read about a interesting solution about powerful PI coil.
Take a speaker wire like that is used for musical boxes about 2x0,5mm diameter, 100feet length (that one whit transparent insulated) roll on around CD spindle cover about 30 times in same plan and brushed with ciclohexanone couple time. That will glue together all PVC surface.Let the PVC surfaces become harden again. Du not cut the conductor, near the coil, just get it to the detector, there twist both conductors to have just one coil not two (remember is a bifilar cable), now the diameter of conductor will be 1mm diameter and that will drive a more power from your detector, but you have to be sure the detector support this power. The coil have no contact whit salted water, are hard insulated on all his perimeter til to the detector.
If someone do this please tell us how it works!
Regards
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