| Round | Reservoir Dimensions | Capacity | |
| SIU 14 | 14" Diameter x 3.5" High | 1.5 gallon |  |
| SIU 18 | 18" Diameter x 3" High | 2.5 gallon | |
| SIU 20 | 20" Diameter x 3.5" High | 3.5 gallon | |
| SIU 24 | 24" Diameter x 3.5" High | 4.5 gallon | |
| SIU 28 | 28" Diameter x 3.5" High | 6.5 gallon | |
| SIU 32 | 32" Diameter x 3.5" High | 8 gallon | |
| SIU 36 | 36" Diameter x 3.5" High | 10 gallon | |
| SIU48 | 48" Diameter x 3.5" High | 19 gallon | |
| Rectangular | |||
| SIUR 19 | 19" L x 8" W x 3" H | 1.5 gallon |  |
| SIUR 25 | 25" L x 8" W x 3" H | 2 gallon | |
| SIUR 31 | 31" L x 8" W x 3" H | 2.5 gallon | |
| Square | |||
| SIUSQ 12 | 12" L x 12" W x 3" H | 1.5 gallon | |
| SIUSQ 16 | 16" L x 16" W x 3" H | 2.5 gallon | |
| SIUSQ 23 | 23" L x 23" W x 3" H | 5.5 gallon |
