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Table 6 Water quality at different cleaning frequencies as shown in 2 reviewed studies

From: The effect of household storage tanks/vessels and user practices on the quality of water: a systematic review of literature

Author (Year) Indicator Regular Cleaning Interval (Months) Cleaning Frequencies per Year
< 2 2 4 6 3+ 1 to 2 > 1
Nnaji et al. (2019) TC ≈ mean (MPN/100ml) < 5 18 20 90    
E. coli ≈ mean (MPN/100ml) 0 3 6 7    
HPC ≈ mean (cfu/ml) 0 10 27 37    
pH ≈ mean 6.8 6.95 6.9 7.05    
Schafer and Mihelcic (2012) E. coli - mean (cfu/100ml)      8.2 33.2 34.3
TC - mean (cfu/101ml)      36 202.8 565.3
Turbidity - NTU      3.7 6.1 4.4