GRE AR720 Manual De Instalación Y Mantenimiento página 4

4.1 Assembly the pressure gauge in models AR720 and AR725
5 .OPERATION
The operation of this filter is based on the filtration capacity of the silica sand which is inside. The water in the pool is
driven by the filter pump and forced to pass through the silica sand. The sand acts as a filtering element which retains the
impurities in the water. The environment, trees, pollen, insects and frequency of bathing, as well as other factors,
determine the dirtiness of the water in the pool. Depending on the dirtiness, the silica sand in the filter should be cleaned
with greater or less frequency (see section 5.3).
To maintain the pool water in good condition, use the chemical products recommended by the manufacturer (chlorine,
alga protection, flocculant etc.).,
THE CHEMICAL PRODUCT SHOULD NEVER BE PLACED IN THE BASKET OR THROUGH THE FILTER, THIS
WOULD DETERIORATE THE MATERIALS OF THE UNIT AND LIMIT ITS EFFICACY.
Priming the filter
The filter must be correctly primed at all times. If the filter is not primed this means that an air chamber has been created
inside which causes defective circulation of water. This fact prevents proper filtration of the water by the silica sand and is
detrimental to the motor.
The filter may become unprimed for several reasons:
• Starting up a new unit.
• Starting up a unit after an extended period of inactivity.
• Following use of a suction bottom cleaner.
• Air absorbed by the skimmer due to the low level of water in the pool.
• Due to incorrect use of the unit, suction cover or skimmer plug.
When is the filter unprimed?
The filter is unprimed when:
• The water entering the filter sounds like it is falling freely. This fact indicates that an air chamber has been created
between the water inlet and the silica sand.
• An excess of air bubbles are released through the feedback nozzle.
• The bottom cleaner (not supplied) does not operate with suction, and the silica sand remains clean after the
cleansing.
How can we prime the filter?
• Verify that the suction hose is connected to the skimmer and the passage is clear (the plug is not in place).
• Disconnect the filter from the power point.
• With the valve on the filtration setting, slightly loosen the drain nut which is next to the pressure gauge so that the air
which has built up inside the filter will be released. If the drain T has not been set in place, loosen the triangular knob
until water is released through the waste outlet without bubbles.
• When you see that only water is released (for 1 to 2 minutes), retighten the nut.
• Connect the filter to the power point and check that the sound of falling water is no longer heard. Otherwise, repeat
the operation.
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