WHERE THE POPULATION OF THE VILLAGE IS LESS, A HAND PUMP FILTER IS INSTALLED. BECAUSE OF THAT WE CANNOT INSTALL BIG RO MACHINES/PLANTS THERE. WE USE HAND PUMP FILTER. IN RURAL AND URBAN AREAS WATER CONTAMINATED WITH HIGH IRON, ARSENIC ALONG WITH HEAVY METALS IS A COMMON PROBLEM NOW DAYS. GENERALLY WATER COMING OUT FROM THESE HAND-PUMPS IS REDDISH IN COLOR & POOR IN TASTE.THE HAND PUMP FILTER MAKES THE CONTAMINATED WATER INTO DRINKING BACTERIA FREE AND POTABLE.