I pg 08
Conditions for Backwashing :-
Time for backwashing is determined by the following conditions:
1. The flow rate through the filter bed decreases until it is insufficient to meet the demand.
2. The removal efficiency of the filter bed decreases to the point where filter water quality deteriorates
or results in dirt or debris returning to the pool.
3. When the pressure gauge reading is 50 kPa (7.2 psi) higher than the start up pressure.
4. If the filter is connected to mains water, pressure rise is not an accurate indicator as mains pressure
tends to fluctuate. It is best to rely on the actual flow rate.
Importance of Backwashing
The importance of backwashing cannot be overstated. Dense filter media can become “packed” without
proper and frequent enough backwashing. Debris will remain trapped and create channeling within the
filter bed. This will result in the filter bed exhausting early. Moreover, if debris is not flushed from the
media grains, the filter bed will become dirtier and dirtier as time goes on until the filter operation fails.
Backwashing Instrustions :-
1. Switch off the Pump / Close the Inlet Valve.
2. Release the filter’s pressure by loosening Pressure Release Valve until the Pressure Gauge needle
drops to zero <0>.
3. Retighten Pressure Release Valve.
4. Depress and turn Handle 180° to the BACKWASH position.
In the BACKWASH position, the water flow is automatically reversed through the filter so that it is
directed to the bottom of the filter vessel, up through the filter bed, flushing the previously trapped
dirt and debris out the waste line.
5. Switch on the Pump / Open the Inlet Valve. Backwash water will flow out through filter bed drain
pipe.
6. When the backwash water in the sight glass appears clear, Switch off the Pump / Close the Inlet
Valve.
7. Depress and turn the handle to the RINSE position.
In the RINSE position water flow is directed through the filter bed as normal filter mode but out
through the waste outlet. This process settles the filter media bed into place and ensures any dirt or
debris is rinsed out of the filter, preventing possible return to the pool.
8. Switch on the Pump / Open the Inlet Valve. Rinse water will flow out through the drain pipe.
9. When the rinse water in the sight glass appears clear. Switch off the Pump / Close the Inlet Valve.
10. Depress and turn the handle to the Filter position and Switch on the Pump / Open the Inlet Valve for
normal operation.
Waterco Fibreglass Filters
