C500
Two Trays 
Based on actual feedback for C1000 and overall dimensions we estimate the one tray available for biological media will hold approximately 60 cu in.
| C500 Filter Capacity Assuming 1 Tray is Used | |
| Media | Media Required |
| Standard & Other Cylindrical Types | .73 kg |
| BioGravel & SuperBioGravel | .85 kg |
C700
Two Trays 
Based on actual feedback for C1000 and overall dimensions we estimate the one tray available for biological media will hold approximately 75 cu in.
| C700 Filter Capacity Assuming 1 Tray is Used | |
| Media | Media Required |
| Standard & Other Cylindrical Types | .9 kg |
| BioGravel & SuperBioGravel | 1 kg |
C1000
Three Trays 
A customer, Frederick, reports that the Cascade 1000 Filter has three trays. Two may be used for biological media.
The trays are 7” L x 5 3/8” W x 2 3/8” H. Each tray holds 89 c in.
| C1000 Filter Capacity Assuming 2 Trays are Used | |
| Media | Media Required |
| Standard & Other Cylindrical Types | 2 kg |
| BioGravel & SuperBioGravel | 2.5 kg |
C1200
Four Trays 
Based on feedback each tray will hold 89 cu in.
| C1200 Filter Capacity Assuming 3 Trays are Used | |
| Media | Media Required |
| Standard & Other Cylindrical Types | 3 kg |
| BioGravel & SuperBioGravel | 3.8 kg |
C1500
Five Trays 
Based on actual feedback from Josh Marcell the trays are 6″ x 8″ x 2″ and will hold approximately 96 cu in each.
| C1500 Filter Capacity Assuming 4 Trays are Used | |
| Media | Media Required |
| Standard & Other Cylindrical Types | 4.7 kg |
| BioGravel & SuperBioGravel | 5.4 kg |