Designed and Developed by A.R. Shivakumar
Government of India Patent Priority No. ****/CHE/2015
https://drive.google.com/file/d/1Cgzlr4Q_OwG1Y9OqDL6lAHvr6VMgwEvg/view?usp=sharing
Raintap
RoofWater filter
Designed and Developed by A.R. Shivakumar Government of https://drive.google.com/file/d/1Cgzlr4Q_OwG1Y9OqDL6lAHvr6VMgwEvg/view?usp=sharing |
Rainwater collected on the roof is very
pure and clean. However, there are many
substances, which get mixed with this pure water on the roof (leaves, bird
droppings, dust etc.). These impurities
need to be filtered before the rainwater is stored or recharged in to the
ground. “Raintap RoofWater Filter” is a
scientifically developed device, which is very effective and user friendly.
This filter will effectively filter roof top rainwater from residential buildings
and smaller institutional or industrial buildings.
These Raintap RoofWater Filters are simple in
design and are very flexible to install in varying field conditions.
An important feature in filtering rainwater
is the separation of the first flush of rainwater from the relatively cleaner
and purer subsequent rainwater.
Installation
of Raintap RoofWater Filter
In a building, rainwater
is normally allowed to flow down from the roof through pipes. PVC pipes are commonly used in the present
times. They are cost effective and convenient for installation. Raintap RoofWater Filter can be installed on
the wall or any flat surface with suitable inlet and outlet pipe fittings.
Depending on the roof area
and the quantity of rainwater flow, the down water pipes of a building are of
varying sizes. For a residential
building one or more 3 inch or 4 inch (90mm/110mm) pipes are used.
Installation of filter to down water PVC pipe
The down water pipes are
placed vertically on the walls. These
pipes receive water from the rooftop through 900 bend or elbow
attached to them at the top. The other
end of the pipe is left free for the water to flow down or attached with a 450
elbow or a bend to facilitate the water to flow away from the building.
RoofWater Filter comes in
a carton box and will have 6 components.
Raintap RoofWater Filter
is installed at the bottom end of the down water pipe. The pipe running down on the wall need to be
fitted with a 900 elbow or a bend and connected to the inlet
(rainwater inlet) of the Raintap RoofWater Filter. The connection from the down water pipes to
the inlet is through the 90mm or 110mm (3” or 4”) elbow and a connecting pipe
or a reducer collar. The filter so installed must have a gap of minimum 12
inches from the floor. This will facilitate
easy flow of flush water with undesirable substances coming from the roof. Raintap
RoofWater Filter has an outlet (filtered water outflow) through 110 mm Tee
joint. Make sure that the Tee joint is seated on the filter body without any
gap in-between. This Tee joint along with the filter cartridge can be turned in
any direction (3600) in its place.
This will facilitate positioning of the filter outlet in any direction
convenient for installation in the site.
This facility is provided in the filter to add flexibility in connecting
the outlet of the filter in the required direction to allow filtered water to
flow in to the tank.
The out flow of the filter
through this outlet is connected to the storage tank. The filter so installed need to be anchored
to the wall by using screws at 3 locations.
Two screw holes are provided at the bottom of the filter and a clamp
with holding socket is provided at the filter body top behind the outlet tee
joint. A templet with three holes is provided in the packing carton box and the
same may be placed on the wall at suitable location beside down water pipe for
marking the screw holes’ location. Using 5 mm concrete drilling bit, three
holes are drilled and the plastic screw plugs provided in the kit need to be
pushed / driven in to these holes. The metal clamp provided in the kit need to
be fixed first in to the top hole by using the stainless steel screw provided
in the kit and the clamp should be facing downwards. Now the filter is placed
on the wall and aligning the top slot on the filter to the metal clamp, filter
body is gently pushed upwards to position the clamp firmly inside the slot on
the filter body. The two holes facing the wall at the bottom of the filter need
to be aligned in to the two holes with plastic plugs. Using the remaining two
stainless steel screws the filter can be fixed firmly by tightening the screws
in to the bottom two holes.
Inlet and out let pipe connection
Down water pipe carrying
the roof water need to be connected to the inlet of the filter with proper pipe
fittings (90mm or 3 inch elbow or bend and if required pipe collar). Filtered
rainwater outlet need to be connected to a pipe and suitable fittings (110 mm
or 4 inch) to channel the filtered water in to the water storage tank or
underground sump. Make sure the elbows or bends or pipe connecting to the
filter at inlet and outlet are firmly anchored on to the wall with proper pipe
clamps and screws.
Raintap RoofWater filter
has a drain / flush pipe at the bottom. This pipe can be either left free or
can be connected with a suitable pipe to channel the dirty water while flushing
or back washing the filter cartridge in to the drain or for ground water
recharge.
Filter element
Filter element is made of
plastic net and mesh of varying sizes to effectively filter rainwater from the
roof of a building. This filter cartridge is designed for the life time of the
filter and normally need not be replaced. A cap-holder rim on the top facilitates
installation of the filter element inside the filter body and also positions
the filter element at appropriate height inside the filter body. While removing the filter element from the
filter, gently pull the cap-holder vertically upwards. Make sure the entire length of the filter
element is pulled out of the filter before tilting. While installing the filter element back in
to its position, make sure the mesh role enters the barrel without any
crinkle. Gently push the filter element
downwards up till the cap-holder sits and positions itself on the vertical
column of the filter.
The filter cartridge cap
has a spring loaded knob and the knob need to be pushed inside before pressing
down the filter cartridge in to its position. The bottom of the filter
cartridge has a flow stopper arrangement and sits on a rubber O-ring. This
arrangement allows the water to flow out of the filter at the bottom or stop
the flow when required.
Important
·
Raintap
RoofWater Filter must be installed in vertical position only.
·
Raintap
RoofWater Filter can handle rainwater from a maximum of 1000 sq. ft. of roof
area with 1000mm / 40 inch annual rainfall
·
Keep
the Raintap RoofWater Filter dry during non-rainy days by lifting the filter
cartridge and releasing the spring loaded knob on to the rim of the outlet.
This will release stagnant water inside the filter body along with all the dirt
collected and filtered.
How Raintap RoofWater Filter works?
The rainwater is allowed to flow from down pipes
in to the filter and as the filter cartridge is in its top position, the
initial flow with all the dust, bird droppings etc. will flow out. This need to
be practiced during the first rain of the season. Subsequently the filter
cartridge need to be in its position to close the flush valve at the bottom. Water
received in the receptor flows upwards against gravity through the filter
element to filter most of the floating elements and allow water to
stabilize in this filtration zone.
Rainwater passing through this filter element is relatively cleaner and
flows out through an outlet, which can be led to storage tank.
Filter element is mounted on a vertical stabilizer
barrel with a friction fit. Filter element need to be cleaned periodically
during the rainy season to remove the impurities trapped and there by keep the
filtration system clean. In the event
filter is not cleaned and the filter element is getting clogged, “Raintap
RoofWater Filter” has a safety feature built into it. The water pressure pushes out the clogged
filter element from the stabilizer barrel and allows the water to flow out
freely from the drain pipe at the bottom.
This safety feature will avoid flooding of the rooftop because of
clogged filter. For normal working
condition, filter cartridge need to be in its position closing the bottom drain
pipe.
Maintenance
of filter
Back wash arrangement is provided to clean the filter
cartridge. A hose connector provided at the top of the filter cartridge need to
be connected to your tap with a hose pipe. Make sure the filter cartridge is in
the open position by pulling the filter cartridge upwards till it pin comes out
and the cartridge sits on the pin. This will allow the dirty water to flow out
at the bottom. By allowing the tap water through the filter cartridge back wash
can be achieved and the dust and other impurities embedded inside the filter
cartridge get released and flow out through the bottom pipe. When the clean
water start flowing out at the bottom or after three minutes of back wash, the
tap water flow may be stopped and filter installed in its position for
filtering rainwater.
When the
rain stops, flush the filter by gently lifting the filter cartridge from its position
until the cartridge stands on the spring loaded knob. The water with all the filtered dirt gets
released and washes off. After five
minutes, push the filter cartridge back to its position by pressing the spring
loaded knob. Take care to position the
filter cartridge correctly in its position and the bottom stopper sits
correctly on the O-ring.