Sludge produced by water drawn from sources with relatively low turbidity tends to be:

When considering water drawn from sources with relatively low turbidity, the characteristics of the resulting sludge are influenced by the types of solids present in the water. In this case, the sludge produced tends to be very gelatinous and hard to handle.

Low turbidity generally indicates that the water contains fewer suspended particles, such as silt and clay. Consequently, the organic materials and microorganisms are more prominent in the sludge, leading to a gelatinous consistency. This type of sludge can be challenging to manage and dewater due to its sticky nature, which can cause it to clump together and resist flow.

In contrast, thinner and more watery sludge would typically arise from sources with higher turbidity, where silt and mineral content contribute to a more fluid consistency. The remaining options suggest conditions that are inconsistent with the characteristics of low turbidity influent, such as overly dry or solid sludge or sludge that is overly airy, which do not align with the gelatinous nature observed in this context.