OK, you sound like an expert (not sarcasm) so if I may (and please note I never suggested a squaring relationship), > High pressure water can be fairly efficie

OK, you sound like an expert (not sarcasm) so if I may (and please note I never suggested a squaring relationship), > High pressure water can be fairly efficiently converted... And lower pressure less efficiently converted? Therefore the higher the column, the higher the pressure and the better the efficiency of the conversion?