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2009 Nalco Company
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Technical Help
(630) 305-CHEM
3D TRASAR
5500 - Installation & Operation Manual
45. My tower is blue. Why?
As noted before, 3D TRASR Bio-Control will impart a slight blue color to the tower water
. The effect
will be amplified as the depth of the water in the basin is increased. This is normal.
The tower can turn bluer than normal if any one of the following conditions is true:
• Bio-Reporter was accidentally overfed.
• 3D TRASAR Bio-Control was initiated without waiting for the halogen levels in the tower to dissi-
pate to < 0.1 ppm.
• 3D TRASAR Bio-Control was used in monitoring mode.
• Oxidant was slug fed to the tower, intentionally or otherwise (e.g. leakage of bleach tank) without
turning 3D TRASAR Bio-Control off.
• Make-up water is highly halogenated (see section above for details)
• Recirculation of tower water is not optimal. That is, System Volume/Recirculation Rate >30.
• Pellet feeder was left on manual on.
46. Bio-reporter concentrations aren’t approaching set-point. Why?
Please check the following:
• Are you out of bio-reporter product?
• Is the tower water recirculating properly?
• Is there adequate flow through the pellet feeder? Is the output from the pellet feeder being dis-
charged into the system (not to drain and not to a dead leg) in a well-mixed zone?
• Is the Pellet feeder ball valve seat leaking?
47. Why is my Pellet Feeder drain line dripping blue water?
This is normal. Typically, you will notice a small amount of blue water dripping after a pellet feed.
Water from the pressurized side of the ball valve will eventually reach the level of the drain line.
Each time a tablet is dropped into the valve, a water volume equivalent to the pellet volume will be
displaced and will exit the drain. This water will be blue due to a small amount of dissolved dye.
The drain line should be plumbed to a drain.
Water in the drain line is only drained by gravity
so any hose or piping should never go above the exit of the drain line.
48. Do I have to adjust the Pellet Feeder ball valve for leakage?
Over time, especially in systems where a large number of tablets are being fed (> 50 per day), the
seals may need to be adjusted. This is detailed in the manual. If the drain line is leaking when no
pellets are being fed, or if large amounts of water are being expelled during a feed, the seals
should be adjusted.
