water samples have 3 sources
by using plastic bottles have lid with a capacity of one liter
1. river: sampling water in River that a depth of about one-foot containers must be rinsed with water samples collected before 2 -3 times before collection. Samples must be collected and quickly
2. The sampling of water from the plant. To collect all the points with effluent discharged or stored. The combined effluent
3. The sampling of wastewater from houses that Collect from sewers.