New experimental data are presented on the axial and radial distribution of solid particles suspended in a baffled, agitated liquid for the common - but previously uninvestigated - geometry of multiple concentric cooling coils around the impeller. Particle distribution trends are identified in relation to impeller speed, liquid height, and number of radial flow impellers on a single shaft. Interpretation of the results is in terms of material balances and also by a new application of an approach taken from the field of air pollution control. The latter estimates the surplus fraction of suspended solids that remain confined within the innermost coil because of its impediment to solids transport in the radial direction. Fair agreement is obtained between these retained solids estimates from material balance and from coil impediment considerations.