Effective Rainwater Filter – For rooftop rainwater harvesting – Very low-cost, do-it-yourself filters

Eco friendly ideas & concepts
SAMPATH S
Posts: 63
Joined: October 28th, 2014, 1:00 pm

Re: Effective Rainwater Filter – For rooftop rainwater harvesting – Very low-cost, do-it-yourself filters

Post by SAMPATH S »

SUMP OVERFLOW PIPE:

Often, rainwater harvesting sump is provided with an overflow pipe so that when the sump is full with rainwater, the excess is carted away to ground water recharge pit or in some cases to the drainage, etc., through such overflow pipe.

In rare cases, even sumps for other purposes like bore well water or even Cauvery water sump is also similarly connected to an overflow pipe.

We all strive to keep the sump clean from cockroaches, lizards, earth worms, other insects, and rarely rats also.

Now, the overflow pipe opens the possibility for entry of living organisms like above from the other end of the overflow pipe, which is beyond our observation and control. Even covering the overflow pipe with steel wire mesh, etc., only limits the chances but not totally eliminate them.

Hence it is of utmost importance that NO SUCH OVERFLOW PIPE IS PROVIDED from sump tank/s.

In case of rainwater, when overflow of sump occurs, the best way is to cart away the excess rainwater by opening the valve provided for First Flush.
SAMPATH S
Posts: 63
Joined: October 28th, 2014, 1:00 pm

Re: Effective Rainwater Filter – For rooftop rainwater harvesting – Very low-cost, do-it-yourself filters

Post by SAMPATH S »

FIRST FLUSH and Rainwater harvesting for storage:

First Flush is a term which every Rainwater harvesting (for storage and reuse) enthusiast is familiar with.

Rooftop is naturally susceptible to accumulate dust and other impurities besides dead/living insects, etc. because of its very location. When it rains after many days, the amount of accumulated impurities on the rooftop would be substantial and it is better to flush this water out. This is referred to as FIRST FLUSH. First flush water is generally sent for groundwater recharge or sometimes routed to the storm water drain.

However, one can reduce the incidence of impurities by trying to periodically clean the rooftop.

While first flush water is certainly not fit for domestic usage, let alone for potable purposes, yet one can think of using this water for purposes like watering plants, floor washing, vehicle washing and such other miscellaneous purposes.

The first flush water may be collected in a suitable storage like plastic tank, etc., generally placed at ground level (actually slightly raised, so that the water can be tapped out). This water has both floating as well as sinking impurities. The floating impurities, to a large extent, can simply be removed by using a large strainer. The heavier impurities will settle down at the bottom of the storage. Even the dispersed dust particles will also settle down in a couple of days. Thus, the stored water would be fairly clear and can be used for miscellaneous purposes specified above.

Thus one can ensure that even the FIRST FLUSH rainwater is put to good use.

I am following this method for the last few years and am enjoying its benefit and am quite happy with it.
SAMPATH S
Posts: 63
Joined: October 28th, 2014, 1:00 pm

Re: Effective Rainwater Filter – For rooftop rainwater harvesting – Very low-cost, do-it-yourself filters

Post by SAMPATH S »

Pre-monsoon rains have started in Bengaluru yesterday.

It is time to be ready with your EFFECTIVE RAINWATER HARVESTING FILTERS to harvest the rainwater.

To make the bucket cuttings for EFFECTIVE FILTERS, while one can very well use simple tools like the hacksaw blade and a poker tool, today we have multi use power tools available widely at reasonable cost and these tools invariably form part of the arsenal of DO IT YOURSELF enthusiasts. Power tools make the work effortless and also accurate.

Here are the pictures of the simple tools as well as the power tools that may be used:

Hacksaw blade
hacksaw blade.jpg
hacksaw blade.jpg (10.55 KiB) Viewed 84 times
Poker tool
Poker.jpg
Adjustable circle cutter drill bit
Adjustable circle cutter drill bit.jpg
Adjustable circle cutter drill bit.jpg (20.46 KiB) Viewed 84 times

(Continued in next post)
SAMPATH S
Posts: 63
Joined: October 28th, 2014, 1:00 pm

Re: Effective Rainwater Filter – For rooftop rainwater harvesting – Very low-cost, do-it-yourself filters

Post by SAMPATH S »

(continued from previous post)

Drilling machine
Drilling machine.jpg
Drilling machine.jpg (13.8 KiB) Viewed 84 times
Jigsaw machine
Jigsaw.jpeg
Jigsaw.jpeg (15.45 KiB) Viewed 84 times
Angle grinder machine
Angle grinder.jpg
Angle grinder.jpg (9.73 KiB) Viewed 84 times

It is better to avoid Angle grinder machine as it rotates at about 12,000 RPM which not only makes it difficult to control the cutting, but also generates substantial heat which can somewhat burn the plastic.

In subsequent posts, further details of making of the EFFECTIVE FILTER buckets would be provided.
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