Pentair V250 Manuel D'utilisation page 22

V 2 5 0
Even when using the backwash valve, it is possible to have untreated
water at the outlet from the valve during the regeneration phase. To
avoid this, use a shut-off valve.
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MANUAL_V250.indd 22
By-pass valve
UNMIXED WATER
P2
P1<P2
HARD WATER
P1
MIXED WATER
P2
P1>P2
HARD WATER
P1
Fig. 2: By-pass valve / Backwash valve
20
Open backwash valve
Closed backwash valve
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