Step-by-step Guide
Procedure For
Initial Soaking of DMX-065 Filtration Media
Please FOLLOW
the 9 steps below:
1) Place the
DMX-065 into a filter
-
Ensure a minimum bed depth is as least 600mm,
700mm or more is recommended.
-
A Minimum of 40% of the bed depth is required as
freeboard above the DMX-065.
2) Fill the filter to the top with water and
add Sodium Hypochlorite Solution -Chlorine (12.5% solution) to the
water and stir mix well (at the recommended rate of 10 liters of
sodium hypochlorite per M3 of DMX-065, or 10 ml per 1 liter
of DMX-065.) See the Calculator below for the Initial Chlorine
Required for Soaking DMX-065 at Set up Stage
3) Soak for a minimum of 30 minutes (the
longer the better).
4) Backwash the media whilst continually
injecting the solution of Sodium Hypochlorite. The approximate
backwash flow rate recommended being LV 30 to LV 35 m/hr. Ensure
that the Chlorine level being injected is giving a residual
chlorine level of approximately 1 ppm. Backwash until the
manganese content falls to below 0.3 ppm and the backwash water
becomes clearer.
5) Ensure the backwash rate is sufficient to
lift the media bed so that the very fine material is completely
removed from the media.
During the initial stages of the backwash, fines
will be removed and the colour of the water will be dark. At the
latter stages of the backwash, the water will become clearer.
Backwash time will vary between 20 to 40 minutes.
The time it takes for the Manganese concentration
to fall to below 0.3 mg/l varies. Check this level after 20 to 40
minutes, and if it is still too high check every 30 minutes.
SERVICE MODE
6) When the manganese level has dropped -
fallen to below 0.3 ppm in the backwash mode and the backwash
water becomes clear, place the filter system into SERVICE MODE.
7) Start the SERVICE mode-cycle whilst at
the same time continually injecting Sodium Hypochlorite (chlorine)
reducing the level of chlorine until a RESIDUAL Chlorine level of
0.1 to 0.3 ppm is reached (Please note the Service mode flow rate
is slower than backwash rate.
8) When the filter water has reached a Manganese
level of 0.03mg/l, check the residual Chlorine level and
reduce the residual Chlorine level to between 0.1 to 0.3 ppm.
9) When the residual Chlorine level reaches 0.1
to 0.3 ppm and remains stable, the DMX-065 is ready for
normal operation, continuous use.
