Table 3 - Effect of glutaraldehyde biocide on laboratory-scale rotating biological contactors and biocide efficacy

Table 3. Higher organisms in the biofilms on the RBC discs at the end of the experiments.

Organisms	Glutaraldehyde concentration (ppm)
Organisms	0 (Control)	40	80	180
Protozoa	+ + +	+ +	+ +	-
Rotifer	+ +	+	+	-

(+ + +) represents many live cells observed; (+ +) represents some live cells observed; (+) represents few live cells observed; (-) represents no cell observed.