CW	Constructed Wetland
MWSP	Macrophyte-based wastewater stabilisation pond
RGR	relative growth rate (d${}^{-1}$)
$\lambda$	nitrogen to proton ratio (mol N·mol${}^{-1}$ ${\mathrm{H}}^{+}$)
ΔpH	absolute pH change
ΔpHavg	running average of pH change based on ten values
ΔpH/ΔpHavg	ratio of absolute pH change and average pH change
$ϵ$	ratio of pH-uptake reduction (pH units · pH units${}^{-1}$)