ELGI'S PORTABLE AIR COMPRESSOR HAVING AN OUTPUT OF 1100 CFM AT 350 PSIG IS DESIGNED TO BE USED INDEPENDENTLY TO DRILL DEPTHS OF UP TO 50 TO 80 METERS, BEYOND WHICH A BOOSTER CAN BE ACCOMPANIED TO GENERATE EXTRA AIR PRESSURE FOR FURTHER DRILLING. WHEN A DRILL REACHES THE WATER TABLE, EVEY 10 M OF WATER PRODUCES ONE BAR OF BACK PRESSURE. THE 350 PSIG COMPRESSOR PROVIDES BETTER EFFICIENCY IN THESE CONDITIONS AS, EVEN WHILE OPERATING DEEP INTO THE WATER TABLE, TI WILL BE RUNNING AT THE SAME SPEED ENABLING HIGHER RATES OF PENETRATION.