Table 4

Drinking water: purification, quality control (frequency and location of sampling) and acidification, expressed as percentage

Quality control of drinking water: frequency of sampling
At least twice a year11.5
Once a year19.2
Once every two years15.4
Once every three years40.4
Only when troubles occur7.7
Never5.8
Quality control of drinking water: location of sampling
At the source31.7
At the water tank0.0
At the nipples/water troughs/tap in the stable68.3
Acidification of drinking water, per production category AlwaysSometimes
Sows10.05
Piglets18.818.8
Fattening pigs11.42.3
Drinking water purification
No purification50.0
Filtration25.0
Deferrisation10.9
Chlorine dioxide4.7
Sump3.1
Copper sulphate1.6
Hydrogen peroxide1.6
Descaling1.6
Aeration1.6