water samples have 3 sources
by using plastic bottles have lids with a capacity of one liter
1. river: sampling water in the River that a depth of about 30 cm containers must be rinsed with water samples collected before 2 -3 times before collection. Samples must be collected and quickly
2. collecting of water from the plant. To collect all the points with effluent discharged or stored. The combined effluent
3. collecting of wastewater from houses that sewers.