The Nautilus FNS is a vertical grid diatomaceous earth (D.E.) filter designed to remove suspended matter from pool water. It operates under pressure and requires a charge of D.E. to cover the vertical filter grid cloth. The filter housing is made of corrosion-resistant materials and is intended to provide years of service with proper maintenance. The manual covers operational data for models FNS 24, 36, 48, and 60, detailing flow rates over various hours of operation.
| Maximum operating pressure | 50 pounds per square inch |
|---|---|
| Recommended D.E. for FNS 24 | 2.5 - 3.5 pounds |
| Recommended D.E. for FNS 36 | 3.5 - 5.5 pounds |
| Recommended D.E. for FNS 48 | 5-7 pounds |
| Recommended D.E. for FNS 60 | 6-9 pounds |
The recommended amount is between 2.5 and 3.5 pounds.
Backwashing is needed when the pressure has increased 7 to 10 psi from the initial reading.
No, the filter should not be operated without a D.E. charge for more than two minutes.