Tap water ran for 5 min before each
sampling. For the analysis of physical parameters, a 500 ml polypropylene
bottle was used. For microbiological analysis,water was sampled in
two (one duplicate) 250ml sterilized polypropylene bottles. Two amber
plastic bottles were used for chlorophyll A and bromide sampling in RW.
For THMs and HAAs, a dechlorinating agent (166 μl of ammonium chloride
at 30 g/l) was added to four glass vials (40 ml) (one vial for THMs
and HAAs individually, and two extra replicates) to neutralize the free
chlorine residual and to avoid further DBP formation between sampling
and analysis (USEPA, 2006). The number of samples was the same for all
systems and seasons. Each parameter was analyzed monthly at each
given sampling point. Consequently, at the same sampling point the
same parameter was analyzed three times per season.