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Dear Binaya and Phil, I agree with Steve regarding driving flow of 30 Litres per minute with a fall of 6 Metres for 2''/1'' Hydram, to lift water to 26 Metres height is low. The following references are forwarded regarding drive flow required for 2''/1'' Hydram : (a) FAO Irrigation and Drainage Paper - 43; Section 4.9.3 : Water Lifting Devices : Volume of water required to operate 2''/1'' Hydram - 27 to 55 Litres per minute) (b) Development Technology Unit, Warwick University; New Development in Hydraulic Ram Pumping; Technical Release - 13, 1996 : For 50 mm Drive Pipe - 100 Litres per minute and for 25 mm Drive Pipe - 25 Litres per minute (c) Development Technology Unit, Warwick University; DTU S-2 Ram Specification; Technical Release - 14, 1998 : For 37.5 mm (1.5'') Drive Pipe - 40 to 80 Litres per minute and for 50 mm (2'') Drive Pipe - 60 to 120 Litres per minute. After seeing the photograph of you Hydram, the following remedial measures are suggested:- (a) Check the Volume of Air chamber of your 2''/1'' Hydram ? Its volume should be 3.4 gallon ( 12.85 litres). As a thumb rule, the length of Air chamber with 4'', 6''& 8'' pipe will be 62'', 40'' & 27 '' respectively. (b) For smooth operation, sniffer valve to be provided 2 cm below delivery valve and it will not cost you much. (c) Even after having required size of Air Chamber and after providing sniffer valve ; if your 2''/1'' Hydram, is not able to lift water to 26 Metres height with a fall of 6 Metres; then as I had suggested in earlier mail of 05 Oct 2014 please install two 1''/0.5'' Hydram and you will be able to lift the water upto 26 metre height. Wish you Happy pumping with hydram. With warm regards Col Binay Kumar www.prakriti-farms.org