Changes

— worn out washers, cupseals and bearings;<br>— excessive corrosion that causes pump rods to break, and leaks to appear in the rising mains;<br>— many pumps are of poor quality;<br>— the biggest drawback of suction pumps is that they can lift water to only about 7 m, and if the water table falls below that level, the pump becomes inoperable and must be replaced with a deep-well pump;<br>— contaminated water is often used to prime suction pumps;<br>— most pumps are designed for family use and are not sturdy enough for communaluse.<br>