Tank Owner’s Manual Pg. 17 of 23 9/26/05 Rev. D APPENDIX B
Filter Model Filter Area
(Ft2)
Total Media
Requirement
(Ft3)
Sand Media
(Ft3)
Gravel Media
(Ft3)
(Optional)
Freeboard
Height
(in.)
Sand Bed
Depth
(in.)
Gravel
Depth
(in.)
THS3461 13.5 16.6
(1660 lbs.) 11.1
(1110 lbs.) 5.5
(550 lbs.)
THS3484 19.0 23.5
(2350 lbs.)
14.4
(1440 lbs.)
9.1
(910 lbs.)
THS4272 19.7 29. 1
(2910 lbs.)
22.1
(2210 lbs.)
7.0
(700 lbs.)
THS4284 23.2 34.6
(3460 lbs.)
27.1
(2710 lbs)
7.5
(750 lbs.)
THS4296 26.7 39.9
(3990 lbs.)
31.3
(3130 lbs.)
8.6
(860 lbs.)
Media Type Media Size Specific Gravity Uniformity
Coeffictient
Pea Gravel 1/4" - 1/8" Greater than 2.5 Less than 1.5
Sand #20 Standard
.018"-.022"
(.45mm-.55mm) 2.65 Less than 1.5
7 1/2 11 8 5/16
8 1/2 16 7 1/2

NOTE:

1. All gravel and sand should be washed and screened. It should contain less than

1% of loam, clay, sand, shells, dirt organic impurities or other foreign matter.

2. It is recommended that all media used be NSF approved.