Clack Flow Washer Sizing Chart
NOTE: All flow rates greater than 10 GPM or with an * require the 1" Drain Line Assembly (V3008-04)
| Water Softener Resin | |||
| Your Tank Size | Backwash Flow Rate | Service Flow Rate | Optimal Flow Washer |
| 9 | 1.7 | 1.7 | Clack 1.3 GPM (V3162-013) |
| 10 | 2.1 | 2.1 | Clack 2.7 GPM (V3162-027) |
| 12 | 3.0 | 3.0 | Clack 3.2 GPM (V3162-032) |
| 13 | 3.5 | 3.5 | Clack 3.2 GPM (V3162-032) |
| 14 | 4.1 | 4.1 | Clack 4.2 GPM (V3162-042) |
| Tannin / Organic Resin | |||
| Your Tank Size | Backwash Flow Rate | Service Flow Rate | Optimal Flow Washer |
| 9 | 1.2 | 1.2 | Clack 3/4" 1.3 GPM (V3162-013) |
| 10 | 1.5 | 1.5 | Clack 3/4" 1.7 GPM (V3162-017) |
| 12 | 2.2 | 2.2 | Clack 3/4" 2.7 GPM (V3162-027) |
| 13 | 2.6 | 2.6 | Clack 3/4" 2.7 GPM (V3162-027) |
| 14 | 3.0 | 3.0 | Clack 3/4" 3.2 GPM (V3162-032) |
| Granular Activated Carbon (GAC) | |||
| Your Tank Size | Backwash Flow Rate | Service Flow Rate | Optimal Flow Washer |
| 9 | 2.7 | 2.21 | Clack 3/4" 2.7 GPM (V3162-027) |
| 10 | 3.4 | 2.73 | Clack 3/4" 3.2 GPM (V3162-032) |
| 12 | 4.8 | 3.93 | Clack 3/4" 5.3 GPM (V3162-053) |
| 13 | 5.7 | 4.61 | Clack 3/4" 6.5 GPM (V3162-065) |
| 14 | 6.6 | 5.35 | Clack 3/4" 6.5 GPM (V3162-065) |
| Micro-Z / Nextsand / Zeolite | |||
| Your Tank Size | Backwash Flow Rate | Service Flow Rate (Max) | Optimal Flow Washer |
| 9 | 6.4 | 6.2 | Clack 3/4" 6.5 GPM (V3162-065) |
| 10 | 7.9 | 7.6 | Clack 3/4" 9.0 GPM (V3162-090) |
| 12 | 11.4* | 11.0* | Clack 1" 13.0 GPM (V3190-130)* |
| 13 | 13.4* | 12.9* | Clack 1" 13.0 GPM (V3190-130)* |
| 14 | 15.5* | 15.0* | Clack 1" 17.0 GPM (V3190-170)* |
| Calcite | |||
| Your Tank Size | Backwash Flow Rate | Service Flow Rate | Optimal Flow Washer |
| 9 | 5.3 | 2.6 | Clack 3/4" 5.3 GPM (V3162-053) |
| 10 | 6.5 | 3.3 | Clack 3/4" 6.5 GPM (V3162-065) |
| 12 | 9.4 | 4.7 | Clack 3/4" 9.0 GPM (V3162-090) |
| 13 | 11.0* | 5.5 | Clack 1" 11.0 GPM (V3190-110)* |
| 14 | 12.8* | 6.4 | Clack 1" 13.0 GPM (V3190-130)* |
| Filter-OX | |||
| Your Tank Size | Backwash Flow Rate | Service Flow Rate (Max) | Optimal Flow Washer |
| 9 | 5.3 | 5.3 | Clack 3/4" 5.3 GPM (V3162-053) |
| 10 | 6.5 | 6.5 | Clack 3/4" 6.5 GPM (V3162-065) |
| 12 | 9.4 | 9.4 | Clack 3/4" 9.0 GPM (V3162-090) |
| 13 | 11.1* | 11.1* | Clack 1" 11.0 GPM (V3190-110)* |
| 14 | 12.8* | 12.8* | Clack 1" 13.0 GPM (V3190-130)* |
| Katalox Lite | |||
| Your Tank Size | Backwash Flow Rate | Service Flow Rate | Optimal Flow Washer |
| 9 | 4.0 | 4.0 | Clack 4.2 GPM (V3162-042) |
| 10 | 5.0 | 5.0 | Clack 3/4" 5.3 GPM (V3162-053) |
| 12 | 7.0 | 7.0 | Clack 3/4" 7.5 GPM (V3162-075) |
| 13 | 8.3 | 8.3 | Clack 3/4" 9.0 GPM (V3162-090) |
| 14 | 9.6 | 9.6 | Clack 3/4" 10.0 GPM (V3162-100) |