20
• Fold a filter disc twice as shown in the figure. Separate one side from the other three to form a cone.
Insert the folded filter disc in the funnel.
• Filter the treated sample into an empty beaker.
The sample is now ready.
Note
: Filter at least 40 mL of solution if all the four methods will be tested. If the solution is still turbid
or colored, treat it again with a packet of active carbon. After use, throw the filter disc away and wash
the syringe and the filter assembly well. Always use a new disc for another sample.
NUTRIENTS SOLUTION (MR):
• Use the graduated cylinder to measure exactly 20 mL of sample.
• Remove the cap and fill the Demineralizer Bottle with tap water.