Turbidity is unexpectedly high

Allow some time for measurements to stabilize. If this doesn't help, try cleaning the turbidimeter (see Maintenance.

Flocs look funny

If the flocs are white in color and float,

• Check the flow rate into the pilot plant by looking at the digital monitor, located next to the wall facing Cornell University's Flocculator. If it is much lower than 23 gal/min:
  • Toggle the pump on and off. If this doesn't work:
  • The pump that drives the water through the plant may not be operating properly. There may be objects caught in the screen (e.g. leaves) or there may be electrical issues. Clean the screen on the pump or toggle the pump on and off a few times. (As always, ask one of the operators if you're unsure of what to do.)
• The turbidity of the incoming water may be fairly low, and the alum dose may be too high. Lower the alum dose slightly. (See Troubleshooting Start-up.)

If the effluent water is turbid and does not contain large flocs, but the water is not unsually white, the alum dose probably is not high enough. Increase the alum dose in Process Controller to account for the increased turbidity. (See Troubleshooting Start-up.) This is likely to occur if there has been a lot of rain.