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Table 1 provides an overview of the bacterial population found in backwash water samples from the first stage filter (‘BW 1st RSF’) and the pilot filter column (‘BW A1’). The sequencing results of sample ‘BW 1st RSF’ are based on 188,241 sequences, whereas the results of sample ‘BW A1’ are based on 55,298 sequences. The taxonomic trees are shown in Appendices A and B (Supplementary Information, available with the online version of this paper).

Table 1

Bacterial population in samples of ‘BW 1st RSF’ and ‘BW A1’

SampleIdentification% of population
BW 1st RSF Gallionella spp. 97.0 
Other 3.0 
BW A1 Nitrospira spp. 25.7 
Pseudomonas spp. 14.3 
Gallionella spp. 12.4 
Other 47.6 
SampleIdentification% of population
BW 1st RSF Gallionella spp. 97.0 
Other 3.0 
BW A1 Nitrospira spp. 25.7 
Pseudomonas spp. 14.3 
Gallionella spp. 12.4 
Other 47.6 

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