6. Cover all stored water, pre-filtered and post-filtered, to keep out in-
sects and debris. Containers used for handling and storing source
water (pre-filtered) and containers used for post-filtered water
should be clearly differentiated by shape, size or color to prevent
recontamination of filtered water. Containers must not be used
interchangeably.
7. Protect the biological layer. The paused water protects the
biological layer and the Diffuser Plate protects the paused water.
The biological layer should not be allowed to dry out, as that would
destroy it. If destroyed, the biological layer takes up to 14 days to
redevelop. If the biological layer does dry out for any
reason, a special process needs to be followed. Add clean water
to the filter by pouring it through a funnel inserted into the upturned
Plastic Outlet Tube. The water needs to be absorbed into the filter
from the bottom up so that air in the sand layer can be forced up
and out. The process can be slow, so patience is required. Do not
add water through the Diffuser Plate, as this may cause air pockets
or airlocks to form in the filter, reducing its performance. Once the
water level in the filter is restored above the top of the sand, water
can be poured into the top of the filter through the Diffuser Plate.
Note:
The biological layer, which accounts for most of the filter’s
bacteria reduction, takes up to 14 days to fully develop.
8. The filter is not intended to be moved after installation. If it must be
moved short distances, it may be lifted by its upper rim.
Keep the filter upright and level and avoid jarring or dropping.
Alternatively, secure lifting straps may be placed under the filter to
facilitate lifting and handling. The filter is heavy when loaded with
filter media and water, weighing about 61 kg (135 pounds).
Appropriate care should be taken to avoid personal injury and
filter damage. If jarring or vibration is anticipated while moving, the
filter media should be removed. Removed filter media may not be
able to be reinstalled properly due to the mixing of
materials and loss.
9. Flow rates should continue at .4-.8 liters (400-800ml) per minute at
full head pressure.
Filter Maintenance
There are 4 maintenance considerations: Biological Layer, Filter
Outlet Tube, Diffuser Plate and Clean Water Container. With routine
maintenance, the filter should last up to 10 years or more.
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Summary of Contents for BioSand
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