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12.1.3 Filter backwash
After the filter medium is washed for the first time, with the valve at the filtration setting, the pressure gauge
will show the nominal pressure experienced by the pump. This pressure will vary depending on the pump
flow rate, static pressure and load loss across the pipes.
To preserve a trace of this nominal pressure, align the red needle of the pressure gauge with the needle
indicating the nominal pressure.
After a time, the flowrate at the pool return will drop due to the gradual build up of dirt and debris in the
filter or pump prefilter.
The filter pressure falls below the pressure indicated by the red needle of the pressure gauge: clean the
pump prefilter basket. The prefilter should be cleaned each time the pool is cleaned, or at least once a
week.
Clean out any debris located in the prefilter.
•
stop the pump and turn the multiport valve to CLOSED;
•
unscrew the ball-union-trim assembly from the return fitting and insert a plug in the opening. Insert a
plug in the bottom of the skimmer also (plugs supplied) ;
•
open the prefilter and extract the basket;
•
clean using a water jet to remove dirt and debris;
•
replace the basket;
•
Replace the prefilter lid making sure that the seal is correctly positioned and that there is enough
water to prime the pump;
•
remove the plugs from the skimmer and the return fitting, and screw the ball-union-trim assembly
back into position;
•
turn the multiport valve to FILTRATION and switch the pump on.
If the filter pressure rises 0.3 bar or more above that indicated by the red needle of the pressure gauge:
the filter needs to be cleaned.
•
stop the pump and clean the prefilter if necessary ;
•
switch the multiport valve to WASH;
•
switch the pump on. Cleaning will begin after a few seconds. Monitor the colour of the water passing
through the transparent union on the multiport valve: the water should turn cloudy ;
•
as soon as the water runs clear, stop the pump and switch the valve to RINSE;
•
turn the pump on and let it run for about 30 seconds. This is to remove any debris remaining in the
main valve and to settle the sand;
•
stop the pump and turn the valve to FILTRATION ;
•
switch the pump back on.
After backwashing the black needle should re-align with the red needle that marks the filter's nominal
pressure. If after two backwashes the pressure does not realign with the red needle, inspect the pipework
to ensure that there are no blockages, and that the sand in the filter is in good condition.
12.1.4 Length of the filtration cycle
The length of the filtration cycle corresponds to the time required for one pool water volume to pass
through the filter. For a private pool, the minimum accepted length of the filtration cycle is 6 hours. During
the pool season, filtration must be run every day.
Recommendations will vary depending on the pool water temperature:
•
Below 14°C : 5 to 6 hours filtration per day;
•
15° to 23°C :
•
Above 23°C : 10 to 12 hours filtration per day.
40/48
2021/02 - Version: D Code : 37311
6 to 8 hours filtration per day;
WOODEN POOLS
BWT myPOOL POOL'N BOX
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